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Q.

If A and B are disjoint, the nA∪B is equal to

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a

nA

b

nB

c

nA + nB

d

nA.nB

answer is C.

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Detailed Solution

Since A and B are disjoint, ∴A∩B =∅nA ∩B =0 Now nA∪B=nA + nB -nA∩B = nA + nB-0 =nA + nB.
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