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Show that the operation ** on ZZ, the se...

Show that the operation `**` on `ZZ`, the set of integers, defined by.
`a**b=a+b-2` for all `a,b inZZ`
(i) is a binary operation:
(ii) satisfies commutaitve and associative laws:
(iii) Find the identity elemetn in `ZZ`,
(iv) Also find the inverse of an element `ainZZ.`

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