1.

Let ∗ be the binary operation on N given by a∗b=LCM of a and b. (i) Find 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 ab=LCM of a and b.
(i) Find 57,2016

(ii)Is commutative?

(iii)Is associative?

(iv) Find the identity of in N

(v)Which elements of N are invertible for the operation ?



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