Exams › IBPS PO › Quantitative Aptitude

11, 30, 55, 74, ?, 118

1. 121
2. 99
3. 90
4. 133

Correct answer: 99

Solution

The differences are 19, 25, 19, ?, 19. A better way is to observe alternating increments: +19, +25, +19, +25, +19. So the missing term is 74 + 25 = 99. This matches the final term 99 + 19 = 118.

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