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Odd Man Out and Series - General Aptitude

Find out the wrong number in the series.
Q1:

7, 8, 18, 57, 228, 1165, 6996

A 8

B 18

C 57

D 228

E 1165

ANS:D - 228

Let the given numbers be A, B, C, D, E, F, G. Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers. Clearly, 228 is wrong.