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Let '*' be a binary operation on N given...

Let `'*'` be a binary operation on N given by `a*b=LdotCdotMdot(a , b)` for all `a , b in Ndot` Find `5*7,20*16` (ii) Is * commutative? Is * associative? Find the identity element in N Which element of N are invertible? Find them.

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The correct Answer is:
(i) 5*7=35, 20*16=80 `" "` (ii)* is commutative
(iii)* is associative `" "` (iv) 1
(v) 1
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