During a Hajj field-office aptitude and data-verification exercise, the sequence 4, 9, 19, 39, 79, ? is formed by doubling each term and adding one. Which number replaces the question mark?
- 158
- 159
- 160
- None of these
Explanation
Pattern = Previous × 2 + 1
4 × 2 + 1 = 9
9 × 2 + 1 = 19
19 × 2 + 1 = 39
39 × 2 + 1 = 79
79 × 2 + 1 = 159
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