alleryએક હોસ્ટેલમાં, 60 વિદ્યાર્થીઓ દૈનિક A વાંચે છે, 50 દૈનિક B વાંચે છે અને 20 બંને વાંચે છે. ફક્ત દૈનિક A વાંચતા હોય તેવા કેટલા વિદ્યાર્થીઓ છે?
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
ફક્ત દૈનિક A = n(A) - n(A ∩ B) = 60 - 20 = 40.
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