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\(\begin{array}{c|c} \oplus mod 10 & 2 & 4 & 6 & 8 \\ \hline 2...

Mathematics
JAMB 1994
\(\begin{array}{c|c} \oplus mod 10 & 2 & 4 & 6 & 8 \\ \hline 2 & 4 & 8 & 2 & 6 \\4 & 8 & 6 & 4 & 2\\ 4 & 8 & 6 & 4 & 2\\ 6 & 2 & 4 & 6 & 8\\ 8 & 6 & 2 & 8 & 4\end{array}\)
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 Answer: Option A
Explanation
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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