Odd Man Out and Series problems
- 1. 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.
- 2. 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.
- 3. 3, 7, 6, 5, 9, 3, 12, 1, 15, (....)
Options- A. 18
- B. 13
- C. -1
- D. 3 Discuss
Correct Answer: -1
Explanation:
There 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.
- 4. 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.
- 5. 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.
- 6. 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.
- 7. 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.
- 8. 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.
- 9. 19, 26, 33, 46, 59, 74, 91
Options- A. 26
- B. 33
- C. 46
- D. 59
- E. 74 Discuss
Correct Answer: 33
Explanation:
Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number.
So, 33 is wrong. It must be 35
- 10. 1, 3, 10, 21, 64, 129, 356, 777
Options- A. 10
- B. 21
- C. 64
- D. 129
- E. 356 Discuss
Correct Answer: 356
Explanation:
A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.
So, 356 is wrong.
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