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4, 9, 19, 39, 79, ?

A169

B159

C119

D139

Answer:

B. 159

Read Explanation:

4 + 5 = 9 9 + 5×2 = 19 19 + 10×2 = 39 39 + 20×2 = 79 79 + 40×2 = 159


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