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Question

Let A = {a, b, c} and B = {5, 7, 9}. State, which of the given are relations from B to A.
{ (5, 7), (9, 9), (7, 5) }

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Solution

For a set of ordered pairs to be a relation from B to A, then the x-coordinates of the ordered pairs should be from B and the y-coordinates should be from A.
Now, in the given set of ordered pairs, the y-coordinates are not from the set A. Hence, the given set of ordered pairs is not a relation from B to A.

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