When 'n' is divided by 5 the remainder is 2. What is the remainder when n2 is divided by 5?
n = 5k+2 (where k is quotient )
so $$n^2 = 25k^2 + 4 + 20k$$
Now when $$n^2$$ will divided by 5 , remainder will be 4.
Create a FREE account and get:
Quick, Easy and Effective Revision
By proceeding you agree to create your account
Free CAT Formulae PDF will be sent to your email address soon !!!
