Question
In each of the following number series, one term is
wrong. Find the wrong term. 8, 15, 31, 59, 121, 239, 479Solution
Pattern is: 8 x 2 - 1 = 15 15 x 2 + 1 = 31 31 x 2 - 3 = 59 59 x 2 + 3 = 121 121 x 2 - 5 = 237 237 x 2 + 5 = 479 So the correct series should be: 8, 15, 31, 59, 121, 237, 479 Hence, 239 is the wrong term.
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