SSC CHSL 6 Dec 2015 Shift 1 Paper

Question : 20 of 200

Marks: +1, -0

4, __ , 19, 39, 79, 159

Solution:

The pattern followed is that number of the form

(5 × 2^n)

is added where is whole number.

4 +(5×2^0)=9

9+(5×2^1)=19

19 + (5×2^2)=39

39+(5×2^3)= 79

79+(5×2^4) =159

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