Exams › IBPS PO › Quantitative Aptitude

Directions (75–77): Study the series and answer the following question. Q75. 1, 3, 9, 31, 129, 651, ?

1. 625
2. 37
3. 153
4. 771

Correct answer: 771

Solution

The pattern follows successive operations that generate the next term from the previous one. Observing the differences and multipliers leads to the next value as 771. This is a standard number-series pattern question.

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