एक परीक्षा में (150) विद्यार्थियों में (82) ने प्रश्न (A), (76) ने प्रश्न (B), (69) ने प्रश्न (C), (37) ने (A) और (B), (32) ने (B) और (C), (29) ने (C) और (A), तथा (15) ने तीनों हल किए। कम से कम एक प्रश्न हल करने वाले कितने हैं?
In an exam, among (150) students, (82) solved question (A), (76) solved question (B), (69) solved question (C), (37) solved (A) and (B), (32) solved (B) and (C), (29) solved (C) and (A), and (15) solved all three. How many solved at least one question?
Explanation opens after your attempt
A. (144)
Concept
At least one is (82+76+69-37-32-29+15=144). In three sets, do not forget to add the centre at the end.
Why this answer is correct
The correct answer is A. (144). At least one is (82+76+69-37-32-29+15=144). In three sets, do not forget to add the centre at the end.
Exam Tip
कम से कम एक (82+76+69-37-32-29+15=144) है। तीन समुच्चयों में केंद्र को अंत में जोड़ना न भूलें।
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