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Question

If X={1,2,3,4,5},Y={1,3,5,7,9}, then which among the following is not a relation from X to Y

A
R1={(x,y):y=x+2;xX,yY}
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B
R2={(1,1),(2,1),(3,3),(4,3),(5,5)}
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C
R3={(1,1),(1,3),(3,5),(3,7),(5,7)}
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D
R4={(1,3),(2,1)(2,5),(3,7),(7,9)}
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