alleryA और B के सम्मिलन (यूनियन) में 90 सदस्य हैं, A∩B में 20 सदस्य हैं और A में 60 सदस्य हैं। B में कितने सदस्य हैं?
A50
B70
C30
D40
Answer & Solution
Correct answer: A. 50
सूत्र 90 = 60 + B - 20 से, B = 50।
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