SSC GD 2021 PYQ — Question 63

The correct answer is option 2 i.e. 9.

Concept used:

Cyclicity of 3 = 4

Calculations:

Remainder when 149 is divided by cyclicity of 3 i.e. 4 = 1

Remainder when 150 is divided by cyclicity of 3 i.e. 4 = 2

Remainder when 151 is divided by cyclicity of 3 i.e. 4 = 3

Unit place digit = (3 + 3² + 3³) = 3 + 9 + 27 = 39

Here, unit digit is 9.