alleryA আৰু B-ৰ সংযোগত 90 টা সদস্য আছে, A∩B-ত 20 টা আৰু A-ত 60 টা সদস্য আছে। B-ত কিমানটা সদস্য আছে?
A50
B70
C30
D40
Answer & Solution
Correct answer: A. 50
90 = 60 + B - 20 ৰ পৰা, B = 50।
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