ARITHMETIC APTITUDE: Odd One Out

ARITHMETIC APTITUDE

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Find the odd one: 3, 5, 11, 12, 17, 21

a) 5 b) 11 c) 12 d) 21

Correct Answer is (c) 12.

Show Explanation

Because it is the only even number, while the others are odd.

Find the odd one: 8, 27, 64, 100, 125, 216, 343

a) 27 b) 100 c) 343 d) 8

Correct Answer is (b) 100.

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The odd one in the sequence is 100. The rest of the numbers are perfect cubes:

8 is 2³
27 is 3³
64 is 4³
125 is 5³
216 is 6³
343 is 7³

However, 100 is not a perfect cube.

Find the odd one: 6, 9, 15, 21, 24, 28, 30

a) 9 b) 24 c) 28 d) 21

Correct Answer is (c) 28.

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The odd one in the sequence is 28.

6: divisible by 3 (3 * 2)
9: divisible by 3 (3 * 3)
15: divisible by 3 (3 * 5)
21: divisible by 3 (3 * 7)
24: divisible by 3 (3 * 8)
30: divisible by 3 (3 * 10)

However, 28 is not divisible by 3, making it the odd one out in the sequence.

Find the odd one: 1, 4, 9, 16, 20, 36, 49

a) 20 b) 9 c) 36 d) 49

Correct Answer is (a) 20.

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The odd one in the sequence is 20. The other numbers are perfect squares:

1 is 1²
4 is 2²
9 is 3²
16 is 4²
20 is not a perfect square
36 is 6²
49 is 7²

Find the odd one: 10, 25, 45, 54, 60, 75, 80

a) 80 b) 54 c) 25 d) 75

Correct Answer is (b) 54.

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Each of the numbers in the sequence is a multiple of 5, except for 54

Find the odd one: 1, 4, 9, 16, 23, 25, 36

a) 23 b) 36 c) 9 d) 4

Correct Answer is (a) 23.

Show Explanation

The odd one in the sequence is 23. The other numbers are perfect squares:

1 is 1²
4 is 2²
9 is 3²
16 is 4²
23 is not a perfect square
25 is 5²
36 is 6²

Find the odd one: 2, 5, 10, 17, 26, 37, 50, 64

a) 17 b) 64 c) 37 d) 26

Correct Answer is (b) 64.

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The odd one in the sequence is 64. The other numbers follow a pattern:

2: 1² + 1
5: 2² + 1
10: 3² + 1
17: 4² + 1
26: 5² + 1
37: 6² + 1
50: 7² + 1
64: 8²

Find the odd one: 396, 462, 572, 427, 671, 264

a) 671 b) 572 c) 396 d) 427

Correct Answer is (d) 427.

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In each of the given numbers, excluding 427, the middle digit is obtained by adding the other two digits together. Let's break it down:

396: 3 + 6 = 9
462: 4 + 2 = 6
572: 5 + 2 = 7
427: Not following the pattern
671: 7 + 1 = 8
264: 2 + 4 = 6

Therefore, 427 is the odd one out as it doesn't adhere to the pattern where the middle digit is the sum of the other two digits.

Find the odd one: 10, 14, 16, 18, 21, 24, 26

a) 16 b) 21 c) 24 d) 14

Correct Answer is (b) 21.

Show Explanation

21 is the odd one out in this sequence because it is an odd number, while the others are even.

Find the odd one: 16, 25, 36, 72, 144, 196, 225

a) 225 b) 36 c) 196 d) 72

Correct Answer is (d) 72.

Show Explanation

The odd one in the sequence is 72. The other numbers are perfect squares:

16 is 4²
25 is 5²
36 is 6²
72 is not a perfect square
144 is 12²
196 is 14²
225 is 15²

Find the odd one: 835, 734, 642, 751, 853, 981, 532

a) 981 b) 751 c) 853 d) 642

Correct Answer is (b) 751.

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In each number except 751, the difference of the first and third digits is the middle one:

835: 8 - 5 = 3
734: 7 - 4 = 3
642: 6 - 2 = 4
751: Does not follow the pattern
853: 8 - 3 = 5
981: 9 - 1 = 8
532: 5 - 2 = 3

Find the odd one: 331, 482, 551, 263, 383, 362, 284

a) 331 b) 551 c) 263 d) 383

Correct Answer is (d) 383.

Show Explanation

383 does not follow the pattern where the product of the first and third digits equals the middle digit in this sequence.

331: 3 × 1 = 3
482: 4 × 2 = 8
551: 5 × 1 = 5
263: 2 × 3 = 6
383: Does not follow the pattern
362: 3 × 2 = 6
284: 2 × 4 = 8

Find the odd one: 3, 5, 7, 12, 17, 19

a) 12 b) 17 c) 7 d) 19

Correct Answer is (a) 12.

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The odd one in the sequence is 12 which is an even number. The other numbers are prime numbers

Find the odd one: 41, 43, 47, 53, 61, 71, 73, 81

a) 53 b) 81 c) 73 d) 71

Correct Answer is (b) 81.

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The odd one in the sequence is 81. The other numbers are prime numbers:

41: Prime
43: Prime
47: Prime
53: Prime
61: Prime
71: Prime
73: Prime
81: Not a prime number (odd one out)

Find the odd one: 582, 605, 588, 611, 566, 617, 600, 623

a) 605 b) 566 c) 617 d) 611

Correct Answer is (b) 566.

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566 is the odd one out in this sequence as it does not follow the alternating pattern of adding 23 and subtracting 17:

582: 582 + 23 = 605
605: 605 - 17 = 588
588: 588 + 23 = 611
611: 611 - 17 = 594
566: Does not follow the pattern (odd one out)
617: 617 - 17 = 600
600: 600 + 23 = 623

Find the odd one: 22, 33, 66, 99, 121, 279, 594

a) 279 b) 121 c) 594 d) 33

Correct Answer is (a) 279.

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279 is the odd one out in this sequence as all other numbers are multiple of 11.

22: 2 x 11 = 22
33: 3 x 11 = 33
66: 6 x 11 = 66
99: 9 x 11 = 99
121: 11 x 11 = 121
279: odd one out (Not a multiple of 11)
594: 54 x 11 = 594

Find the odd one: 8, 13, 21, 32, 47, 63, 83

a) 21 b) 63 c) 47 d) 32

Correct Answer is (c) 47.

Show Explanation

47 is the odd one out in this sequence as it does not follow the pattern of going on adding 5, 8, 11, 14, 17, 20. It should be 46 in place of 47.

8: 8 + 5 = 13
13: 13 + 8 = 21
21: 21 + 11 = 32
32: 32 + 14 = 46
47: 46 + 17 = 63 (odd one out, as it deviates from the pattern)
63: 63 + 20 = 83

Find the odd one: 1, 8, 27, 64, 124, 216, 343

a) 27 b) 124 c) 216 d) 343

Correct Answer is (b) 124.

Show Explanation

124 is the odd one out in this sequence as it does not follow the pattern of being the cube of an increasing integer.

1: 1³ = 1
8: 2³ = 8
27: 3³ = 27
64: 4³ = 64
124: 5³ = 125 (odd one out, as it deviates from the cube sequence)
216: 6³ = 216
343: 7³ = 343

Find the odd one: 1, 2, 6, 15, 31, 56, 91

a) 6 b) 31 c) 56 d) 91

Correct Answer is (d) 91.

Show Explanation

91 is the odd one out in this sequence as it does not follow the correct pattern. Last number of given series should be 92 in place of 91.

1: 1 + 0² = 1
1: 1 + 1² = 2
2: 2 + 2² = 6
6: 6 + 3² = 15
15: 15 + 4² = 31
31: 31 + 5² = 56
56: 56 + 6² = 92 (odd one out, as it deviates from the correct pattern)

Find the odd one: 52, 51, 48, 43, 34, 27, 16

a) 43 b) 34 c) 48 d) 27

Correct Answer is (b) 34.

Show Explanation

34 is the odd one out in this sequence as it does not follow the correct pattern of subtracting alternate increasing odd numbers.

52: 52 - 1 = 51
51: 51 - 3 = 48
48: 48 - 5 = 43
43: 43 - 7 = 36
34: 34 - 9 = 25 (odd one out, 34 must be replaced by 36)
27: 27 - 11 = 16

Find the odd one: 4, 6, 8, 9, 10, 11, 12

a) 12 b) 11 c) 10 d) 9

Correct Answer is (b) 11.

Show Explanation

11 is the odd one out in this sequence as it is a prime number, unlike the others which are composite numbers.

Find the odd one: 105, 85, 60, 30, 0, -45, -90

a) -45 b) 30 c) -90 d) 0

Correct Answer is (d) 0.

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0 is the odd one out in this sequence as it does not follow the correct pattern of subtracting 20, 25, 30, 35, 40, 45 from successive numbers.

105: 105 - 20 = 85
85: 85 - 25 = 60
60: 60 - 30 = 30
30: 30 - 35 = -5
0: -5 - 40 = -45 (odd one out, as it deviates from the correct pattern)
-45: -45 - 45 = -90

Find the odd one: 5, 16, 6, 16, 7, 16, 9

a) 9 b) 7 c) 6 d) 16

Correct Answer is (a) 9.

Show Explanation

Numbers at odd positions are 5, 6, 7, (9)8 etc. and each 16 is present in even positions. So, 9 is the odd one and should be replaced by 8.

Find the odd one: 125, 127, 130, 135, 142, 153, 165

a) 130 b) 165 c) 142 d) 153

Correct Answer is (b) 165.

Show Explanation

165 is the odd one out in this sequence as it does not follow the correct pattern of adding consecutive prime numbers.

125: 125 + 2 = 127
127: 127 + 3 = 130
130: 130 + 5 = 135
135: 135 + 7 = 142
142: 142 + 11 = 153
153: 153 + 13 = 166(odd one out, as it deviates from the pattern)

Find the odd one: 46080, 3840, 384, 48, 24, 2, 1

a) 2 b) 3840 c) 48 d) 24

Correct Answer is (d) 24.

Show Explanation

24 is the odd one out in this sequence as it does not follow the correct pattern of successively dividing by 12, 10, 8, 6, ... etc. 24 must be replaced by 8 (48 ÷ 6 = 8).

46080: 46080 ÷ 12 = 3840
3840: 3840 ÷ 10 = 384
384: 384 ÷ 8 = 48
48: 48 ÷ 6 = 8
8: 8 ÷ 4 = 2 (odd one out, as it deviates from the pattern)
2: 2 ÷ 2 = 1

Find the odd one: 6, 13, 18, 25, 30, 37, 40

a) 37 b) 25 c) 40 d) 30

Correct Answer is (c) 40.

Show Explanation

40 is the odd one out in this sequence as it does not follow the correct pattern of alternating addition of 7 and 5.

6: 6 + 7 = 13
13: 13 + 5 = 18
18: 18 + 7 = 25
25: 25 + 5 = 30
30: 30 + 7 = 37
37: 37 + 3 = 40 (odd one out, as it deviates from the pattern)

Find the odd one: 36, 54, 18, 27, 9, 18.5, 4.5

a) 4.5 b) 18.5 c) 9 d) 27

Correct Answer is (b) 18.5

Show Explanation

18.5 is the odd one out in this sequence as it does not follow the correct pattern of alternatively multiplying by 1.5 and dividing by 3.

36: 36 × 1.5 = 54
54: 54 ÷ 3 = 18
18: 18 × 1.5 = 27
27: 27 ÷ 3 = 9
9: 9 × 1.5 = 13.5
18: 18 ÷ 3 = 6 (odd one out, as it deviates from the pattern)

Find the odd one: 56, 72, 90, 110, 132, 150

a) 132 b) 90 c) 150 d) 110

Correct Answer is (c) 150.

Show Explanation

150 is the odd one out in this sequence as it does not follow the correct pattern of being the product of consecutive numbers.

56: 7 × 8
72: 8 × 9
90: 9 × 10
110: 10 × 11
132: 11 × 12
150: 12 × 13 (odd one out, as it deviates from the correct pattern)

Find the odd one: 25, 36, 49, 81, 121, 169, 225

a) 36 b) 81 c) 49 d) 169

Correct Answer is (a) 36.

Show Explanation

The numbers are squares of odd natural numbers, starting from 5 up to 15. 36 is the odd one out in this sequence as it square of an even number:

25: 5²
36: 6² (odd one out, as it deviates from the correct pattern)
49: 7²
81: 9²
121: 11²
169: 13²
225: 15²

Find the odd one: 7, 8, 18, 57, 228, 1165, 6996

a) 18 b) 6996 c) 228 d) 1165

Correct Answer is (c) 228.

Show Explanation

228 is the odd one out in this sequence as it does not follow the correct pattern of multiplying by consecutive natural numbers and adding the same number.

7: 7 × 1 + 1= 8
8: 8 × 2 + 2 = 18
18: 18 × 3 + 3 = 57
57: 57 × 4 + 4 = 232
228: 232 × 5 + 5 = 1165 (odd one out, as it deviates from the correct pattern)
1165: 1165 × 6 + 6 = 6996

Find the odd one: 1, 1, 2, 6, 24, 96, 720

a) 2 b) 720 c) 96 d) 24

Correct Answer is (c) 96.

Show Explanation

96 is the odd one out in this sequence as it does not follow the correct pattern of multiplying by consecutive natural numbers.

1: 1 × 1 = 1
1: 1 × 2 = 2
2: 2 × 3 = 6
6: 6 × 4 = 24
24: 24 × 4 = 96 (odd one out, as it deviates from the pattern)
96: 96 × 6 = 576
720: 720 × 8 = 5760

Find the odd one: 196, 169, 144, 121, 100, 80, 64

a) 80 b) 121 c) 169 d) 64

Correct Answer is (a) 80.

Show Explanation

80 is the odd one out in this sequence as it does not follow the correct pattern of being the square of decreasing consecutive natural numbers.

196: (14)²
169: (13)²
144: (12)²
121: (11)²
100: (10)²
80: (9)² = 81 (odd one out, as it deviates from the correct pattern)
64: (8)²

Find the odd one: 445, 221, 109, 46, 25, 11, 4

a) 11 b) 109 c) 4 d) 46

Correct Answer is (d) 46

Show Explanation

46 is the odd one out in this sequence as it does not follow the correct pattern of subtracting 3 and dividing the result by 2.

445: (445 - 3) ÷ 2 = 221
221: (221 - 3) ÷ 2 = 109
109: (109 - 3) ÷ 2 = 53
46: (53 - 3) ÷ 2 = 25 (odd one out, as it deviates from the correct pattern)
25: (25 - 3) ÷ 2 = 11
11: (11 - 3) ÷ 2 = 4
4: (4 - 3) ÷ 2 = 0.5

Find the odd one: 190, 166, 145, 128, 112, 100, 91

a) 145 b) 100 c) 91 d) 128

Correct Answer is (d) 128

Show Explanation

128 is the odd one out in this sequence as it does not follow the correct pattern of subtracting 24, 21, 18, 15, 12, 9 from the numbers.

190: 190 - 24 = 166
166: 166 - 21 = 145
145: 145 - 18 = 127
128: 128 - 15 = 113 (odd one out, as it deviates from the correct pattern)
112: 112 - 12 = 100
100: 100 - 9 = 91

Find the odd one: 19, 26, 33, 46, 59, 74, 91

a) 59 b) 46 c) 74 d) 33

Correct Answer is (d) 33.

Show Explanation

19 + 7 = 26
26 + 9 = 35 (not 33)
35 + 11 = 46
46 + 13 = 59
59 + 15 = 74
74 + 17 = 91

So, according to the provided pattern of adding odd numbers, the correct sequence is 19, 26, 35, 46, 59, 74, 91.

Find the odd one: 1, 3, 10, 21, 64, 129, 356, 777

a) 129 b) 356 c) 64 d) 777

Correct Answer is (b) 356.

Show Explanation

356 is indeed the odd one out in this sequence.

1 × 2 + 1 = 3
3 × 3 + 1 = 10
10 × 2 + 1 = 21
21 × 3 + 1 = 64
64 × 2 + 1 = 129
129 × 3 + 1 = 388 (not 356)

Find the odd one: 6, 12, 48, 100, 384, 768, 3072

a) 100 b) 768 c) 384 d) 48

Correct Answer is (a) 100.

Show Explanation

If each even term is obtained by multiplying the previous term by 2, the series should be:

6 × 2 = 12
12 × 2 = 24
24 × 2 = 48
48 × 2 = 96 (not 100)
96 × 2 = 192
192 × 2 = 384
384 × 2 = 768
768 × 2 = 1536
1536 × 2 = 3072

Find the odd one: 40960, 10240, 2560, 640, 200, 40, 10

a) 640 b) 40 c) 200 d) 10

Correct Answer is (c) 200.

Show Explanation

The odd one out is 200, as it deviates from the pattern of dividing the previous term by 4.

40960 ÷ 4 = 10240
10240 ÷ 4 = 2560
2560 ÷ 4 = 640
640 ÷ 4 = 160 (not 200)
160 ÷ 4 = 40
40 ÷ 4 = 10

Find the odd one: 3, 7, 15, 39, 63, 127, 255, 511

a) 127 b) 255 c) 39 d) 63

Correct Answer is (c) 39.

Show Explanation

39 is indeed the odd one out and must be replaced by 31, as it deviates from the multiplication by 2 and adding 1 rule.

3 × 2 + 1 = 7
7 × 2 + 1 = 15
15 × 2 + 1 = 31
31 × 2 + 1 = 63
63 × 2 + 1 = 127
127 × 2 + 1 = 255
255 × 2 + 1 = 511

Find the odd one: 64, 71, 80, 91, 104, 119, 135, 155

a) 80 b) 135 c) 155 d) 104

Correct Answer is (b) 135.

Show Explanation

135 is indeed the odd one out in this sequence of adding odd numbers.

64 + 7 = 71
71 + 9 = 80
80 + 11 = 91
91 + 13 = 104
104 + 15 = 119
119 + 17 = 136 (not 135)
136 + 19 = 155

Find the odd one: 15, 16, 34, 105, 424, 2124, 12756

a) 424 b) 34 c) 2124 d) 105

Correct Answer is (c) 2124.

Show Explanation

It should be 2125 instead of 2124.

15 × 1 + 1 = 16
16 × 2 + 2 = 34
34 × 3 + 3 = 105
105 × 4 + 4 = 424
424 × 5 + 5 = 2125
2125 × 6 + 6 = 12756

Find the odd one: 10, 26, 74, 218, 654, 1946, 5834

a) 26 b) 1946 c) 74 d) 654

Correct Answer is (d) 654.

Show Explanation

654 is the odd one out in this sequence and should be replaced by 650, as it does not follow the correct pattern of multiplying by 3 and subtracting 4.

10: 10 × 3 - 4 = 26
26: 26 × 3 - 4 = 74
74: 74 × 3 - 4 = 218
218: 218 × 3 - 4 = 650
654: 650 × 3 - 4 = 1946 (odd one out, as it deviates from the pattern)
1946: 1946 × 3 - 4 = 5834

Find the odd one: 2880, 480, 92, 24, 8, 4, 4

a) 8 b) 24 c) 480 d) 92

Correct Answer is (d) 92.

Show Explanation

92 is the odd one out in this sequence as it does not follow the correct pattern of dividing by consecutive decreasing numbers.

2880: 2880 ÷ 6 = 480
480: 480 ÷ 5 = 96
92: 92 ÷ 4 = 23 (odd one out, as it deviates from the pattern)
24: 24 ÷ 3 = 8
8: 8 ÷ 2 = 4
4: 4 ÷ 1 = 4

Find the odd one: 3, 7, 15, 27, 63, 127, 255

a) 27 b) 127 c) 63 d) 255

Correct Answer is (a) 27.

Show Explanation

27 is the odd one out in this sequence as it does not follow the correct pattern of multiplying by 2 and adding 1.

3: 3 × 2 + 1 = 7
7: 7 × 2 + 1 = 15
15: 15 × 2 + 1 = 31
27: 27 × 2 + 1 = 55 (odd one out, as it deviates from the pattern)
63: 63 × 2 + 1 = 127
127: 127 × 2 + 1 = 255

ARITHMETIC APTITUDE: Odd One Out

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