Let R be a congruence relation modulo 7 on Z. Then the equivalence class [110] equals to which of the following:
[2]
[3]
[1]
[4]
[5]
If a = b (mod 5), then... Choose all correct statements.
A. a+b = 0 (mod 10)
B. ab = b2 (mod 5)
C. 2(a - b) = ( (mod 20)
D. a} = b3 (mod 5)
E. a+ 7 = b + 12 (mod 5)