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Let *be the binary operation on N given...

Let `*`be the binary operation on N given by `a*b = LdotCdotMdot`of a and b. Find (i) `5 * 7, 20 * 16`(ii) Is `*`commutative? (iii) Is `*`associative? (iv) Find the identity of `*`in N (v) Which elements of N are invert

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