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Q.

Consider the following relations R={x,y/x,y are real numbers and x=wy for some rational number w}, S={mn,pq/m,n,p and q integers such that, n,p0 and qm=pm} then

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a

S is an equivalence relation but R is not an equivalence relation

b

R and S both are equivalence relations

c

Neither R nor S is an equivalence relation

d

R is an equivalence relation but S is not an equivalence relation

answer is C.

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Detailed Solution

We have x,xR for w=1 in plying that R is reflexive for a0,(a,0)R for any W but 0,aR. Then R is not symmeric Hence R is not an equivalence relation Asmn,mns mn=mn, S is reflexive mn,pqsqm=pn np=mq pq,mns, So S is symmetric again mn,pqs and pq,abs means qm=pn and bp=aq mn=pqand pq=abmn=ab Somn,abS This means S is transistive 

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