On dividing a number by 5, we get 3 as remainder. What will the remainder when the square of the this number is divided by 5?
Any number when divided by 5 leaves remainder 3 will be of type: 5k + 3
Square of Number = (5k + 3)2 = 25k2 + 30k + 9
When this square is divided by 5, remainder will be same as the remainder when 9 is divided by 5.
Hence, 4 is the remainder.
The correct option is D.