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Q.  if A is proper subset of B i.e A⊂B then is it true - 

that B⊆A

Ans. No , Never since Ais proper subset hence B is Strictly greater(superset)  than A niether equal nor smaller(subset)

Q. A⊂B then AUB = A  where U means UNION

A. No ,Never as you can see a being proper subset is completely inside B so taking union that is all elements of B and A (each element taking only once) will surely give bigger part as the result here it would be B.

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