alleryஒரு குடியிருப்பில், 70 பேர் இந்தி, 50 பேர் ஆங்கிலம் மற்றும் 30 பேர் இரண்டும் பேசுகிறார்கள். இவ்விரு மொழிகளில் ஏதேனும் ஒன்றையாவது பேசுபவர்கள் எத்தனை பேர்?
A60
B70
C80
D90
Answer & Solution
Correct answer: D. 90
குறைந்தபட்சம் ஒன்று = n(H ∪ E) = 70 + 50 - 30 = 90.
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