- #1

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I let A =(1,2,3...50) and B=(51,52,...100) so there are 25 elememnts of even numbers in each set, multiply them, so there are 625 pairs of (A,B).

- Thread starter libragirl79
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- #1

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I let A =(1,2,3...50) and B=(51,52,...100) so there are 25 elememnts of even numbers in each set, multiply them, so there are 625 pairs of (A,B).

- #2

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No, that's 1 pair: (A,B). Let's think this more carefully. If A = {1,2,3,...,100} = X and B = {1,3,5,...,99}, then what's A*B?I let A =(1,2,3...50) and B=(51,52,...100) so there are 25 elememnts of even numbers in each set, multiply them, so there are 625 pairs of (A,B).

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- #5

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- #6

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You need to think how you could build all the possible A, B pairs that satisfy the condition.

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