allery100 विद्यार्थ्यांच्या पंगडांत 60 क्रिकेट खेळटा, 50 फुटबॉल खेळटा आनी 20 दोनूय खेळटात. कितले खेळगडे दोनूय खेळ खेळनात?
A10
B20
C30
D40
Answer & Solution
Correct answer: A. 10
संघ = n(C) + n(F) - n(C ∩ F) = 60 + 50 - 20 = 90. दोगांय मदीं खेळपी विद्यार्थी = 100 - 90 = 10.
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