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Question

If A={5,6,7,8} and B={6,8,10} find total elements in (AB)×(AB).

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Solution

A={5,6,7,8} and B={6,8,10}
AB={5,6,7,8,10}
AB={6,8}
(AB)×(AB)={5,6,7,8,10}×{6,8}
{(5,6),(5,8),(6,6),(6,8),(7,6),(7,8),(8,6),(8,8),(10,6),(10,8)}

total elements in (AB)×(AB) are 10.

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