On dividing a number by 5, we get 3 as remainder. What will be the remainder when the square of this number is divided by 5?
সমাধান
সঠিক উত্তর: Option D
Let the number be x and on dividing x by 5, we get k as quotient and 3 as remainder.
x = 5k + 3
x2 = (5k + 3)2
= (25k2 + 30k + 9)
= 5(5k2 + 6k + 1) + 4
On dividing x2 by 5, we get 4 as remainder
