RRB NTPC Mains or Stage 2 Model Paper 3 with solutions

Directions (Q. 55-57) : In question identify wrong number in the series

Question : 57 of 120

Marks: +1, -0

0, 7, 28, 63, 124, 215

Solution:

Given 0, 7, 28, 63, 124, 215

1^3 – 1 = 0

2^3 – 1 = 7

3^3 – 1 = 26←

4^3 – 1 = 63

5^3 – 1 = 124

6^3 – 1 = 215

So, 28 is wrong.

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