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Series Completion - Verbal and Reasoning

Directions to SolveIn this type of questions, one term in the number series is wrong. Find out the wrong term.
Q1:

1,3,12,25,48

A 3

B 12

C 25

D 48

ANS:C - 25

Explanation: The terms of the series are (l2 - 02), (22 - l2), (42 - 22), (62 - 32) and (82 - 42). So, 25 is wrong and must be replaced by (62 - 32) i.e. 27.