alleryA اور B کی یونین کے 90 اراکین ہیں، A∩B کے 20 اور A کے 60 ہیں۔ B کے کتنے اراکین ہیں؟
A50
B70
C30
D40
Answer & Solution
Correct answer: A. 50
90 = 60 + B - 20، B = 50 سے۔
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