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Consider the following relations : <br> R={(x,y)|x,y are real number and x=wy for some rational number w}; <br> S={(mn,pq)|m,n,p and q are integers such that n,q0 and qm=pn}. Then


( A ) neither R nor S is an equivalence relation
( B ) S is an equivalence relation but R is not an equivalece relation
( C ) R is an equivalence relation but S is not an equivalence relation
( D ) R and S both are equivalence relations

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