Let ∗ be the binary operation on N given by a ∗ b = L.C.M. of a and b. Find

Which elements of N are invertible for the operation ∗?

(v) Which components of N are invertible for the activity ∗?

Just the component 1 in N is invertible for the activity * in light of the fact that 1 * 1/1 = 1