Question
In the given number series, find the wrong number.
4, 9, 19, 39, 79, 159, 319Solution
ATQ,
Each number ×2 +1:
4 × 2 + 1 = 9
9 × 2 + 1 = 19
19 × 2 + 1 = 39
39 × 2 + 1 = 79
79 × 2 + 1 = 159
159 × 2 + 1 = 319
Therefore, the series is correct
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