alleryA ਅਤੇ B ਦੇ ਯੂਨੀਅਨ ਵਿੱਚ 90 ਮੈਂਬਰ ਹਨ, A∩B ਵਿੱਚ 20 ਅਤੇ A ਵਿੱਚ 60 ਹਨ। B ਦੇ ਕਿੰਨੇ ਮੈਂਬਰ ਹਨ?
A50
B70
C30
D40
Answer & Solution
Correct answer: A. 50
90 = 60 + B - 20 ਤੋਂ, B = 50।
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