JAMB - Mathematics (1994 - No. 21)
\(\begin{array}{c|c} \oplus mod 10 & 2 & 4 & 6 & 8 \\ \hline 2 & 4 & 8 & 2 & 6 \\4 & 8 & 6 & 4 & 2\\ 4 & 8 & 6 & 4 & 2\\ 6 & 2 & 4 & 6 & 8\\ 8 & 6 & 2 & 8 & 4\end{array}\)
The multiplication table above has modulo 10 on the set S = (2, 4, 6, 8). Find the inverse of 2
The multiplication table above has modulo 10 on the set S = (2, 4, 6, 8). Find the inverse of 2
2
4
6
8
คำอธิบาย
The inverse of 2 is 6 since 2 x 6 = 12; under mod 10
12 = 2 which is also the value required
12 = 2 which is also the value required