Which of the following is not a relation on R? (A) A subset of R containg 2 real numbers (B) A set containing a single point (a,b) where both a and b are integers (C) the set {(r,s) ∈ RxR : r< s} (D) The set {(a,b) ∈ RxR: a^{2 }+ b^{3}=1}
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