allery100 વિદ્યાર્થીઓના જૂથમાં, 60 ક્રિકેટ રમે છે, 50 ફૂટબોલ રમે છે અને 20 બંને રમે છે. બંનેમાંથી એક પણ રમત ન રમતા હોય તેવા કેટલા વિદ્યાર્થીઓ છે?
A10
B20
C30
D40
Answer & Solution
Correct answer: A. 10
યોગ = n(C) + n(F) - n(C ∩ F) = 60 + 50 - 20 = 90. એક પણ રમત ન રમતા વિદ્યાર્થીઓ = 100 - 90 = 10.
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