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If A={x,y,z}" and "B={a,b,c,d}. Then, wh...

If `A={x,y,z}" and "B={a,b,c,d}`. Then, which one of the following is not a relation from A to B ?

A

{(x,a), (x,c)}

B

{(y,c), (y,d)}

C

{(z,a), (z,d)}

D

{(z,b), (y,b),(a,d)}

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The correct Answer is:
D
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