alleryA, B എന്നിവയുടെ യൂണിയനിൽ 90 അംഗങ്ങളുണ്ട്, A∩B ന് 20 ഉം A ന് 60 ഉം ഉണ്ട്. B ന് എത്ര അംഗങ്ങളുണ്ട്?
A50
B70
C30
D40
Answer & Solution
Correct answer: A. 50
90 = 60 + B - 20, B = 50 എന്നതിൽ നിന്ന്.
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