alleryদুটি সেটের সংযোগে (union) 30টি উপাদান রয়েছে। একটি সেটে 20টি এবং অন্যটিতে 18টি উপাদান রয়েছে। তাদের উভয় সেটে থাকা সাধারণ উপাদান কয়টি?
A12
B10
C8
D6
Answer & Solution
Correct answer: C. 8
Overlap = 20 + 18 - 30 = 8 টি উপাদান দুবার গণনা করা হয়েছে।
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