allery80 பேரிடம் நடத்தப்பட்ட ஆய்வில், 45 பேர் தேநீரும், 35 பேர் காபியும், 10 பேர் இரண்டும் குடிக்கின்றனர். காபி மட்டுமே குடிப்பவர்கள் எத்தனை பேர்?
A15
B20
C25
D35
Answer & Solution
Correct answer: C. 25
காபி மட்டுமே = n(Coffee) - n(Tea ∩ Coffee) = 35 - 10 = 25.
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