waecmaths question:
Fig1 and Fig 2are the addition and multiplication tables respectively in modulo 5. Use the these tables to solve the equation $(n\otimes 4)\oplus 3=0(\bmod 5)$
Option A:
1
Option B:
2
Option C:
3
Option D:
4
waecmaths solution:
$\begin{align} & \text{Let }n\otimes 4=y \\ & \therefore y\oplus 3=0 \\ & \text{From figure 1, }y=2 \\ & i.e.\text{ }2\oplus 3=0 \\ & \therefore n\otimes 4=2 \\ & \text{Figure 1, }n=3 \\ & i.e.\text{ 3}\otimes 4=2 \\ & n=3 \\\end{align}$
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