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Let A = {3, 5} and B = {7, 11} Let R...

Let A = {3, 5} and B = {7, 11}
Let R = {(a, b): `a in A, b in B , a - b` is odd}.
Show that R is an empty relations from A into B.

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Since none of the numbers 3-7, 3-11, 5-7, 5-11 is an odd number, therefore `R = phi`.
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