Which number is wrong in the series: 1, 2, 6, 15, 31, 56, 91?
- 91
- 31
- 56
- 15
Explanation
The given series is formed by adding 1, 4, 9, 16, 25, and 36 (which are consecutive perfect squares) to the previous term. Breaking it down:
- 1 + 1 = 2
- 2 + 4 = 6
- 6 + 9 = 15
- 15 + 16 = 31
- 31 + 25 = 56
56 + 36 = 92 (not 91)
So, the correct series would be: 1, 2, 6, 15, 31, 56, 92.
Therefore, the wrong number in the series is 91.
Related MCQs
- 44
- 42
- 50
- 60
اس سوال کو وضاحت کے ساتھ پڑھیں
- 103
- 96
- 108
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 72
- 74
- 76
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 148
- 158
- 168
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
