Exams › IBPS PO › Quantitative Aptitude
What will come in place of the question mark (?) in the following series? 15, ?, 1279, 7679, 30719, 61439.
- 159
- 158
- 156
- 155
Correct answer: 159
Solution
The series follows a pattern where each term is generated from the previous one by a specific operation. Working backward from 1279 and checking the options shows that 159 fits the progression. Substituting 159 gives a consistent series pattern leading to the later terms.
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