Question

The remainder when (3)^21 is divided by 5 is (1) 1 (2) 2 (3) 3 (4) 4​

Answer 1

Answer:

option 3):-3

It's remainder is 3 because after 4th power its's last digits is repeat and die to which last digits of 21th power of 3 is 3 so remainder is 3