Discussion
Home ‣ Aptitude ‣ Odd Man Out and Series Comments
- Question
1, 2, 6, 15, 31, 56, 91
Options- A. 31
- B. 91
- C. 56
- D. 15
- Correct Answer
- 91
Explanation1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92Last number of given series must be 92 not 91.
Odd Man Out and Series problems
Search Results
- 1. 1, 8, 27, 64, 124, 216, 343
Options- A. 8
- B. 27
- C. 64
- D. 124 Discuss
Correct Answer: 124
Explanation:
The numbers are 1 3, 2 3, 3 3, 4 3 etc. So, 124 is wrong; it must have been 5 3 i.e., 125.- 2. 8, 13, 21, 32, 47, 63, 83
Options- A. 47
- B. 63
- C. 32
- D. 83 Discuss
Correct Answer: 47
Explanation:
Go on adding 5, 8, 11, 14, 17, 20.So, the number 47 is wrong and must be replaced by 46.
- 3. 22, 33, 66, 99, 121, 279, 594
Options- A. 33
- B. 121
- C. 279
- D. 594 Discuss
Correct Answer: 279
Explanation:
Each of the number except 279 is a multiple of 11.- 4. 582, 605, 588, 611, 634, 617, 600
Options- A. 634
- B. 611
- C. 605
- D. 600 Discuss
Correct Answer: 634
Explanation:
Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.- 5. The banker's discount of a certain sum of money is Rs. 72 and the true discount on the same sum for the same time is Rs. 60. The sum due is:
Options- A. Rs. 360
- B. Rs. 432
- C. Rs. 540
- D. Rs. 1080 Discuss
Correct Answer: Rs. 360
Explanation:
Sum = B.D. x T.D. = Rs. ❨ 72 x 60 ❩ = Rs. ❨ 72 x 60 ❩ = Rs. 360. B.D. - T.D. 72 - 60 12 - 6. 52, 51, 48, 43, 34, 27, 16
Options- A. 27
- B. 34
- C. 43
- D. 48 Discuss
Correct Answer: 34
Explanation:
Subtract 1, 3, 5, 7, 9, 11 from successive numbers.So, 34 is wrong.
- 7. 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.- 8. 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.
- 9. 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.
- 10. 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.
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