Question

Suppose a ≡ b(mod n) and c ≡ d(mod n),then a + c ≡ b + c(mod n).​

Answer 1

written a ≡ b (mod n), if n | (a − b). Congruence mod n is a relation on Z. Theorem 2.1 For a positive integer n, and integers a, b, c , we