Question
Write the composition table for the binary operation multiplication modulo $10 (\times _{10})$ on the set $S = \{2, 4, 6, 8\}.$
| $\times _{10}$ | $2$ | $4$ | $6$ | $8$ |
| $2$ | $4$ | $8$ | $2$ | $6$ |
| $4$ | $8$ | $6$ | $4$ | $2$ |
| $6$ | $2$ | $4$ | $6$ | $8$ |
| $8$ | $6$ | $2$ | $8$ | $4$ |
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