Question: ( d ) . the operation * * * on Z Z defined by ( a , b ) * * * ( c ,

(d). the operation *** on ZZ defined by (a,b)***(c,d)=(ad+bc,bd)
(e). the operation *** on Q-{0} defined by a***b=ab.
(d). the operation *** on ZZ defined by (a,b)***(c,d)=(ad+bc,bd) (e). the

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