Let R be the relation on the set of all real
numbers defined by aRb iffla - bls 1.
Then Ris
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Explanation:
Given relation is aRb is 1+ab>0,
considering both a and b are real numbers,
We know that ab=ba,
⟹aRb=1+ab>0=1+ba>0=bRa,
∴ R is a symmetric relation,
aRa=1+a
2
as $${ a }^{ 2 }$$ is always a positive real number,
$$\therefore 1+{ a }^{ 2 }>0$$,
∴ R is a reflexive relation.
Consider aRb which is 1+ab>0,
and also bRc which is equal to 1+bc>0,
if a=0.5 and b=−0.5 and c=−4,
⟹ both aRb and bRc are satisfied,
aRc=1−2<0
∴ aRc is not a realation,
Hence R is not a equivalence relation,but is a reflexive and symmetric relation.
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