Question
Construct the composition table for $+_5$ on set $S = \{0, 1, 2, 3, 4\}.$

Answer

$a +_5 b =$ the remainder when $a + b$ is divided by $5$.eg. $2 + 4 = 6 $
$\Rightarrow 2 +_5 4 = 1\ \because [$we get $1$ as remainder when $6$ is divided by $5]$
$2 + 4 = 7$
$ \Rightarrow 3 +_5 4 = 2\  \because [$we get $2$ as remainder when $7$ is divided by $5]$
The composition table for $+_5$ on set $S = \{0, 1, 2, 3, 4\}.$
$+_5$ $0$ $1$ $2$ $3$ $4$
$0$ $0$ $1$ $2$ $3$ $4$
$1$ $1$ $2$ $3$ $4$ $0$
$2$ $2$ $3$ $4$ $0$ $1$
$3$ $3$ $4$ $0$ $1$ $2$
$4$ $4$ $0$ $1$ $2$ $3$

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