allery80 લોકોના સર્વેક્ષણમાં, 45 ચા પીવે છે, 35 કોફી પીવે છે અને 10 બંને પીવે છે. ફક્ત કોફી પીતા હોય તેવા કેટલા લોકો છે?
A15
B20
C25
D35
Answer & Solution
Correct answer: C. 25
ફક્ત કોફી = n(Coffee) - n(Tea ∩ Coffee) = 35 - 10 = 25.
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