alleryA এবং B-এর সংযোগে 90 জন সদস্য রয়েছে, A∩B-তে 20 জন এবং A-তে 60 জন রয়েছে। B-এর কতজন সদস্য রয়েছে?
A50
B70
C30
D40
Answer & Solution
Correct answer: A. 50
90 = 60 + B - 20 থেকে পাই, B = 50।
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