Question
Find the missing number in the given number series. 10, 13, 20, 35, ?, 129
Solution
ATQ, Differences: 13−10 = 3 20−13 = 7 35−20 = 15 Pattern in differences: 3, 7, 15, 31, 63 Each = previous (× 2 + 1) So next two differences: 15×2+1 = 31 31×2+1 = 63 Missing term = 35 + 31 = 66
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