SSC CGL 2011 Question Paper Tier 1 - Shift 2 (June 19th)

Question 28

The population of rats is increasing year after year in a village. Find out the missing population from the following information:
Years :        1990  1991  1992  1993  1994  1995
Population :   4        8      16       ?      44      64

Solution

Given statistics follow a pattern like below:
First = 4
Second = 4 * 2
Third = 4 * (2+2)
Fourth = 4 * (2+2+3)
Fifth = 4 * (2+2+3+4)
Sixth = 4 * (2+2+3+4+5)
hence fourth digit will be 28 

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