Questions  

Let X=1, 2, 3, 4, 5 and Y=1, 3, 5, 7, 9. Which of the followingis not  relations from X to Y

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a
R1=x,y|y=2+x, x∈X, y∈Y
b
R2=(1, 1), (2, 1), (3, 3), (4, 3), (5, 5)
c
R3=1,1, 1, 3, (3, 5), (3,7), (5,7)
d
R4=(1, 3), 2, 5, (2, 4), (7, 9)
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detailed solution

Correct option is D

R4 is not a relation from X to Y, because 7, 9∈R4 but 7, 9∉X×Y.

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