1, ?, 5, 10, 20, 40, 80 - Number Series - Series Completion - Verbal Reasoning question | EduGoog.com

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In following number series, two terms have been put within brackets. Choose the appropriate option - 1, ?, 5, 10, 20, 40, 80

A. 1

B. 2

C. 2.5

D. 4

E. None of these

Answer: D. 4

Next number is sum of all previous numbers.

1st Term : 1

2nd Term: 4

3rd Term: 1+4 =5

4th Term: 1+4+5= 10

5th Term: 1+4+5+10=20 and so on....

Posted in: Number Series - Series Completion - Verbal Reasoning