Find out the incorrect number 5, 10, 40, 80, 320, 550, 2560 - Number Series - Series Completion -

A. 80

B. 320

C. 550

D. 2560

E. None of the above

Answer: C. 550

The sequence is * 2, * 4, * 2, * 4,....
So, 550 is wrong and must be replaced by (320 * 2) i.e. 640.

Posted in: Number Series - Series Completion - Verbal Reasoning