begin array c c oplus mod 10 amp 2 amp 4 amp 6 ... - JAMB Mathematics 1994 Question
(\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
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Correct Option: A
The inverse of 2 is 6 since 2 x 6 = 12; under mod 10
12 = 2 which is also the value required
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