A ও B দুটি বিচ্ছেদ (disjoint) সেট হলে, n(A U B)=
A n(A) + n(B)
B) n(A) – n(B)
(C) 0
b) এদের কোনােটিই নয়
ক েদটি সেট এ
R -এর ক্ষেত্রে
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