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Odd Man Out and Series - General Aptitude

Find out the wrong number in the series.
Q1:

3, 7, 15, 27, 63, 127, 255

A 7

B 15

C 27

D 63

E 127

ANS:C - 27

Go on multiplying the number by 2 and adding 1 to it to get the next number. So, 27 is wrong.