4, 9, 19, 39, 79, ?
Explanation:
4 × 2 + 1 = 9 9 × 2 + 1 = 19 19 × 2 + 1 = 39 39 × 2 + 1 = 79
∴ 79 × 2 + 1 = 159
Hence, option (b).
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