Question

If A and B be two sets containing 11 and
15 elemens respectively what can be the
maximum number of elements in AUB?
( the answer is 4 but I need proof)​

Answer 1

4 is not AUB it is n(B)-n(A)

Answer:

A U B=11

Step-by-step explanation:

because AUB={x:x belongs to A and B}

so the maximum number of common elements=11

so maximum value of AUB=11

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hope it helps you