Question 6. Let ∗ be the binary operation on N given by a ∗ b = L.C.M. of a and b. Find
(v) Which elements of N are invertible for the operation ∗?
An element a is invertible in N
Here a is inverse of b.
a*b=L.C.M. od a and b
So 1 is the only invertible element of N
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