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Number Series - Verbal and Reasoning

Q1:

Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?

A (1/3)

B (1/8)

C (2/8)

D (1/16)

ANS:B - (1/8)

This is a simple division series; each number is one-half of the previous number. In other terms to say, the number is divided by 2 successively to get the next result. 

4/2 = 2 2/2 = 1 1/2 = 1/2 (1/2)/2 = 1/4 (1/4)/2 = 1/8 and so on.