\(\begin{array}{c|c} \oplus mod 10 & 2 & 4 & 6 & 8 \\ \hline 2 & 4 & 8 & 2 & 6 \\4 & 8 & 6 & 4 & 2\\ 4 & 8 & 6 & 4 & 2\\ 6 & 2 & 4 & 6 & 8\\ 8 & 6 & 2 & 8 & 4\end{array}\)
The multiplication table above has modulo 10 on the set S = (2, 4, 6, 8). Find the inverse of 2
A
2
B
4
C
6
D
8
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
The inverse of 2 is 6 since 2 x 6 = 12; under mod 10
12 = 2 which is also the value required
Source: Myschool Past Questions Archive (Record #31017)