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Question

If A and B are two disjoint sets, then n AB is equal to
(a) n A+nB
(b) n A+nB-nAB
(c) n A+n B+n AB
(d) n A n B
(e) n A-n B


Solution

(a) n A+nB

Two sets are disjoint if they do not have a common element in them, i.e., AB = .
nAB = nA + nB

Mathematics
RD Sharma XI (2015)
Standard XI

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