(15) प्रश्नों में से (10) प्रश्न हल करने हैं। पहले (5) प्रश्नों में से कम से कम (3) हल करने अनिवार्य हैं। चयन कितने होंगे?
From (15) questions, (10) are to be attempted. At least (3) of the first (5) questions must be attempted. How many selections are possible?
Explanation opens after your attempt
A. (875)
Concept
Choose (3,4,5) from the first (5) and complete from the remaining (10). \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\).
Why this answer is correct
The correct answer is A. (875). Choose (3,4,5) from the first (5) and complete from the remaining (10). \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\).
Exam Tip
पहले (5) में से (3,4,5) चुनकर बाकी (10) से पूर्ति करें। \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\)।
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