Find the missing number in the series: 4, 9, 19, 39, 79, ?

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A 149
B 159
C 169
D 139

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Answer: B. 159

Answer: B) 159
Explanation: Each term is the previous term × 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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Find the missing number in the series: 4, 9, 19, 39, 79, ?

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