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2,3,5,7 all are in both a and b and these are all the elements of b.
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A={1,2,3,4,5,6,7,8,9,10}; B={2,3,5,7}A n B = {2,3,5,7}
We see that B is a proper subset of A.
⇒A n B=B={2,3,5,7}.
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