Question
Find the wrong number in the given number series.
1, 3, 10, 21, 64, 129, 356, 777Solution
Clearly the series pattern is:Â Â x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,..... So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388
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