(90) विद्यार्थियों में (43) रसायन, (39) जीवविज्ञान और (18) दोनों विषय पसंद करते हैं। कोई भी विषय पसंद न करने वाले कितने हैं?
Among (90) students, (43) like Chemistry, (39) like Biology, and (18) like both subjects. How many like neither subject?
Explanation opens after your attempt
B. (26)
Concept
At least one is (43+39-18=64), so neither is (90-64=26). Finding the union first is the easy method.
Why this answer is correct
The correct answer is B. (26). At least one is (43+39-18=64), so neither is (90-64=26). Finding the union first is the easy method.
Exam Tip
कम से कम एक (43+39-18=64) है, इसलिए कोई नहीं (90-64=26)। पहले संघ निकालना आसान तरीका है।
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