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Odd Man Out and Series - General Aptitude

Find out the wrong number in the series.
Q1:

1, 3, 10, 21, 64, 129, 356, 777

A 10

B 21

C 64

D 129

E 356

ANS:E - 356

A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on. So, 356 is wrong.