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(A) The binary operation $^*$ on $N$ is defined as $a \,^* \,b = 	ext{L.C.M. of } a 	ext{ and } b$. For $5 \,^* \,7$: $5 \,^* \,7 = 	ext{L.C.M. of

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$35, 80$

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(A) The binary operation $^*$ on $N$ is defined as $a \,^* \,b = 	ext{L.C.M. of } a 	ext{ and } b$. For $5 \,^* \,7$: $5 \,^* \,7 = 	ext{L.C.M. of } 5 	ext{ and } 7 = 35$. For $20 \,^* \,16$: $20 \,^* \,16 = 	ext{L.C.M. of } 20 	ext{ and } 16$. Since $20 = 2^2 	imes 5$ and $16 = 2^4$,the $L$.$C$.$M$. is $2^4 	imes 5 = 16 	imes 5 = 80$. Thus,$5 \,^* \,7 = 35$ and $20 \,^* \,16 = 80$.

Let $^$ be the binary operation on $N$ given by $a \,^ \,b = \text{L.C.M. of } a \text{ and } b$. Find $5 \,^* \,7$ and $20 \,^* \,16$.

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Let $^*$ be the binary operation on $N$ given by $a \,^* \,b = \text{L.C.M. of } a \text{ and } b$. Find $5 \,^* \,7$ and $20 \,^* \,16$.