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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:

5, 10, 40, 80, 320, 550, 2560

A 80

B 320

C 550

D 2560

ANS:C - 550

Explanation: The correct pattern is x 2, x 4, x 2, x 4, ..... So, 550 is wrong and must be replaced by (320 x 2) i.e. 640.