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Let ** be the binary opertion on N given by a **b=L.C.M. of a and b. Find (i) 5 **7, 20 **16 (ii) Is ** commutative ? (iii) Is ** associative ? (iv) Find the identity of ** ? (v) Which elements of N are invertible for the opertion ** ?

Answer»


Answer :(i) `5 **7 =35,20** 16 =80 ` (II) Yes (III) Yes (IV) 1 (v) 1


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