Discussion
Home ‣ Aptitude ‣ Odd Man Out and Series Comments
- Question
3, 7, 6, 5, 9, 3, 12, 1, 15, (....)
Options- A. 18
- B. 13
- C. -1
- D. 3
- Correct Answer
- -1
ExplanationThere are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted.The next number is 1 - 2 = -1.
Odd Man Out and Series problems
Search Results
- 1. 1, 8, 27, 64, 125, 216, (....)
Options- A. 354
- B. 343
- C. 392
- D. 245 Discuss
Correct Answer: 343
Explanation:
Numbers are 13, 23, 33, 43, 53, 63.So, the missing number is 73 = 343.
- 2. 15, 31, 63, 127, 255, (....)
Options- A. 513
- B. 511
- C. 517
- D. 523 Discuss
Correct Answer: 511
Explanation:
Each number is double the preceding one plus 1.So, the next number is (255 x 2) + 1 = 511.
- 3. 5, 10, 13, 26, 29, 58, 61, (....)
Options- A. 122
- B. 64
- C. 125
- D. 128 Discuss
Correct Answer: 122
Explanation:
Numbers are alternatively multiplied by 2 and increased by 3.So, the missing number = 61 x 2 = 122.
- 4. 7, 26, 63, 124, 215, 342, (....)
Options- A. 481
- B. 511
- C. 391
- D. 421 Discuss
Correct Answer: 511
Explanation:
Numbers are (23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1) etc.So, the next number is (83 - 1) = (512 - 1) = 511.
- 5. 4, -8, 16, -32, 64, (....)
Options- A. 128
- B. -128
- C. 192
- D. -192 Discuss
Correct Answer: -128
Explanation:
Each number is the proceeding number multiplied by -2.So, the required number is -128.
- 6. 7, 8, 18, 57, 228, 1165, 6996
Options- A. 8
- B. 18
- C. 57
- D. 228
- E. 1165 Discuss
Correct Answer: 228
Explanation:
Let the given numbers be A, B, C, D, E, F, G.Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.
Clearly, 228 is wrong.
- 7. 1, 1, 2, 6, 24, 96, 720
Options- A. 720
- B. 96
- C. 24
- D. 6
- E. 2 Discuss
Correct Answer: 96
Explanation:
Go on multiplying with 1, 2, 3, 4, 5, 6 to get next number.So, 96 is wrong.
- 8. 196, 169, 144, 121, 100, 80, 64
Options- A. 169
- B. 144
- C. 121
- D. 100
- E. 80 Discuss
Correct Answer: 80
Explanation:
Numbers must be (14)2, (13)2, (12)2, (11)2, (10)2, (9)2, (8)2.So, 80 is wrong.
- 9. 445, 221, 109, 46, 25, 11, 4
Options- A. 221
- B. 109
- C. 46
- D. 25
- E. 11 Discuss
Correct Answer: 46
Explanation:
Go on subtracting 3 and dividing the result by 2 to obtain the next number.Clearly, 46 is wrong.
- 10. 190, 166, 145, 128, 112, 100, 91
Options- A. 100
- B. 166
- C. 145
- D. 128
- E. 112 Discuss
Correct Answer: 128
Explanation:
Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.190 - 24 = 166 166 - 21 = 145 145 - 18 = 127 [Here, 128 is placed instead of 127] 127 - 15 = 112 112 - 12 = 100 ... and so on.
Therefore, 128 is wrong.
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