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Let * be the binary operation 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 * in N (v) Which elements of N are invertible for the operation *? |
| Answer» Let * be the binary operation 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 * in N (v) Which elements of N are invertible for the operation *? | |