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Find the missing term in the series: 4, 9, 19, 39, ?, 159

Competition practiceAlphanumeric / Series

A80
B78
C79
D77

Step-by-Step Solution

Each term follows x2 + 1:

4 \times 2 + 1 = 9, 9 \times 2 + 1 = 19, 19 \times 2 + 1 = 39, 39 \times 2 + 1 = 79

, and

79 \times 2 + 1 = 159

, confirming 79.

Answer: C) 79

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