## anonymous 5 years ago Find the product 4x2 (mod 5)

1. anonymous

Do you know much about modular arithmetic?

2. anonymous

Because this question just pretty much relies on its definition (and none of the amazing theorems etc. based on it :( ). $\text{If }a \equiv b (\mod n) \text{ then } a = b + kn$ where k is some constant. But that is a little to complex; just divide (4*2) by 5 and the remainder is your answer.