Question
Mathematics Question on Congruence
If a ≡ b (mod m) and x is an integer, then which of the following is incorrect ?
A
(a + x) ≡ (b + x)(mod m)
B
(a - x) ≡ (b - x)(mod m)
C
ax ≡ bx (mod m)
D
(a - x) ≡ (b + x) (mod m)
Answer
(a - x) ≡ (b + x) (mod m)
Explanation
Solution
The correct option is (D) : (a - x) ≡ (b + x) (mod m).