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Question

If A={x:xϵW,3x<6},B={3,5,7} and C={2,4};

find :n(AB).

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Solution

Given : A={x:xϵW,3x<6},B={3,5,7} and C={2,4}

A={3,4,5}
Now, AB means removing the elements of B which are in A

AB={4} as 3,5 are common elements of A and B.

Hence, n(AB)=1.

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