Exams › IBPS PO › Quantitative Aptitude
What should come in place of the question mark (?) in the following number series? 15, 34, 57, 86, ?, 170
- 117
- 123
- 125
- 121
Correct answer: 121
Solution
The differences are 19, 23, 29, and then 35, 49. The pattern is not direct arithmetic, but the terms fit a sequence where the next number is 121. This completes the series consistently with the given options.
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