allery50 பேர் கொண்ட ஒரு வகுப்பில், 30 பேர் கணிதமும், 25 பேர் அறிவியலும், 15 பேர் இரண்டையும் படிக்கிறார்கள். இரண்டையுமே படிக்காதவர்கள் எத்தனை பேர்?
A5
B12
C10
D8
Answer & Solution
Correct answer: C. 10
சேர்ப்பு (Union) = 30 + 25 - 15 = 40 மாணவர்கள், எனவே 50 - 40 = 10 பேர் இரண்டையுமே படிக்கவில்லை.
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