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- Odd man out Series
**Excercise 1**

1. 3, 5, 11, 14, 17, 21

- 21
- 17
- 14
- 3

The Correct answer is :14

Each of the numbers except 14 is an odd number.

The number '14' is the only EVEN number.

2. 3, 5, 7, 12, 17, 19

- 19
- 17
- 5
- 12

The Correct answer is :12

Each of the numbers is a prime number except 12.

3. 41, 43, 47, 53, 61, 71, 73, 81

- 61
- 71
- 73
- 81

The Correct answer is :81

Each of the numbers except 81 is a prime number.

4. 835, 734, 642, 751, 853, 981, 532

- 751
- 853
- 981
- 532

The Correct answer is :751

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

5. 331, 482, 551, 263, 383, 362, 284

- 263
- 383
- 331
- 551

The Correct answer is :383

In each number except 383, the product of first and third digits is the middle one.

6. 16, 25, 36, 72, 144, 196, 225

- 36
- 72
- 196
- 225

The Correct answer is :72

Each of the numbers except 72 is a perfect square.

7. 10, 14, 16, 18, 21, 24, 26

- 26
- 24
- 21
- 18

The Correct answer is :21

Each of the numbers except 21 is an even number

8. 1, 4, 9, 16, 23, 25, 36

- 9
- 23
- 25
- 36

The Correct answer is :23

Each of the numbers except 23, is perfect square.

9. 1, 4, 9, 16, 20, 36, 49

- 1
- 9
- 20
- 49

The Correct answer is :20

${1^{2} 2^{2}3^{2}4^{2}5^{2}6^{2}7^{2}}$ But, instead of 52, it is 20 which to be turned out.

10. 6, 9, 15, 21, 24, 28, 30

- 28
- 21
- 24
- 30

The Correct answer is :28

Each of the numbers except 28, is a multiple of 3.

11. 5, 16, 6, 16, 7, 16, 9

- 9
- 7
- 6
- None of these

The Correct answer is :9

Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.

So, 9 is wrong.

12. 125, 127, 130, 135, 142, 153, 165

- 130
- 142
- 153
- 165

The Correct answer is :165

Prime numbers 2, 3, 5, 7, 11, 13 are to be added successively.

So, 165 is wrong.

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