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.
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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