1.

Determine whether or not each of the definitions of ** given below gives a binary operation. In the event that ** is not a binary operation, give justification for this on Z^+, define ** by a**b=a-b

Answer»

SOLUTION :We have 4,5 `in Z^+` but
4-5=-1 `cancelin Z^+`
`THEREFORE ** ` is not a BINARY OPERATION


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