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A binary operation ** on NN is defined ...

A binary operation `**` on `NN` is defined by `a**b=L.C.M.(a,b)` for all `a,binNN`.
(i) Find `15**18`
(ii) Show that `**` is commutative as well as associative on `NN.`
(iii) Find the the identity element in `NN`.
(iv) Also find the invertible element in `NN`.

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The correct Answer is:
(i) 90 (iii) 1 (iv) only the element 1 is invertible
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