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1.3. If A and B are two sets such that A U B has 40 elements, A has 18 elements and B has 22, how

1.3. If A and B are two sets such that A U B has 40 elements, A has 18 elements and B has 22, how many elements does A intersect B have?

1.4. Show that A U B = A intersect B implies A = B.

1.5. If P(A) subset P(B), what is the relation between A and B?

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