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Let Z be the set of all integers and Z(0...

Let Z be the set of all integers and `Z_(0)` be the set of all non-zero integers. Let a relation R on `ZZ xx ZZ_(0)` be defined as follows :
`(a,b) R (c,d) rrArr ad=bc," "`for `" "` all
`(a,d),(c,d) in ZZxxZZ_(0)`

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