For a certain positive integer n,n2 gives a remainder of 4 when divided by 5, and n3 gives a remainder of 2 when divided by 5. What remainder does n give when divided by 5?
If n = 3 then
mod(n^2,5) = 4
mod(n^3,5) = 2
mod(n , 5) = What do you think?
It would be 3!
