Odd Man Out and Series problems
- 1. 4, 6, 8, 9, 10, 11, 12
Options- A. 10
- B. 11
- C. 12
- D. 9 Discuss
Correct Answer: 11
Explanation:
Each number is a composite number except 11.
- 2. 105, 85, 60, 30, 0, -45, -90
Options- A. 0
- B. 85
- C. -45
- D. 60 Discuss
Correct Answer: 0
Explanation:
Subtract 20, 25, 30, 35, 40, 45 from successive numbers.
So, 0 is wrong.
- 3. 5, 16, 6, 16, 7, 16, 9
Options- A. 9
- B. 7
- C. 6
- D. None of these Discuss
Correct Answer: 9
Explanation:
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.
So, 9 is wrong.
- 4. 125, 127, 130, 135, 142, 153, 165
Options- A. 130
- B. 142
- C. 153
- D. 165 Discuss
Correct Answer: 165
Explanation:
Prime numbers 2, 3, 5, 7, 11, 13 are to be added successively.
So, 165 is wrong.
- 5. 46080, 3840, 384, 48, 24, 2, 1
Options- A. 1
- B. 2
- C. 24
- D. 384 Discuss
Correct Answer: 24
Explanation:
The terms are successively divided by 12, 10, 8, 6, ...etc.
So, 24 is wrong, it should be 8 (48/6 = 8).
- 6. 6, 13, 18, 25, 30, 37, 40
Options- A. 25
- B. 30
- C. 37
- D. 40 Discuss
Correct Answer: 40
Explanation:
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
So, 40 is wrong.
- 7. 36, 54, 18, 27, 9, 18.5, 4.5
Options- A. 4.5
- B. 18.5
- C. 54
- D. 18 Discuss
Correct Answer: 18.5
Explanation:
The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.
- 8. 56, 72, 90, 110, 132, 150
Options- A. 72
- B. 110
- C. 132
- D. 150 Discuss
Correct Answer: 150
Explanation:
The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.
So, 150 is wrong.
- 9. 25, 36, 49, 81, 121, 169, 225
Options- A. 36
- B. 49
- C. 121
- D. 169 Discuss
Correct Answer: 36
Explanation:
The numbers are squares of odd natural numbers, starting from 5 up to 15.
So, 36 is wrong.
- 10. 16, 33, 65, 131, 261, (....)
Options- A. 523
- B. 521
- C. 613
- D. 721 Discuss
Correct Answer: 523
Explanation:
Each number is twice the preceding one with 1 added or subtracted alternatively.
So, the next number is (2 x 261 + 1) = 523.
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