allery70 વ્યક્તિઓના એક જૂથમાં, 40 સામયિક P વાંચે છે, 30 સામયિક Q વાંચે છે અને 10 બંને વાંચે છે. માત્ર એક જ સામયિક વાંચતા હોય તેવા કેટલા છે?
A55
B50
C40
D45
Answer & Solution
Correct answer: B. 50
માત્ર એક જ = (40 - 10) + (30 - 10) = 50.
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