SSC CGL Tier 1 9 August 2015 Shift 2

Instructions

In each of the following questions, a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

Question 104

0, 7, 26, 63, ?

Solution

let the missing term be y 

here the given series is 0, 7, 26, 63, y 

as we can see that :

0 = 0^2 -1

7 = 2^3 - 1

26 = 3^3 - 1

63 = 4^3 - 1

as we can see that all number are equal to cub of consecutive whole numbers minus 1 and hence ,

y = 5^3 - 1= 124 


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