(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
Correct Answer

A. (875)

Step 1

Concept

Choose (3,4,5) from the first (5) and complete from the remaining (10). \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\).

Step 2

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). \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\).

Step 3

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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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: A. (875). Explanation: पहले (5) में से (3,4,5) चुनकर बाकी (10) से पूर्ति करें। \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\)। / Choose (3,4,5) from the first (5) and complete from the remaining (10). \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\).

Which concept should I revise for this Mathematics MCQ?

Choose (3,4,5) from the first (5) and complete from the remaining (10). \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\).

What exam hint can help solve this Mathematics question?

पहले (5) में से (3,4,5) चुनकर बाकी (10) से पूर्ति करें। \(^{5}C_{3}{}^{10}C_{7}+^{5}C_{4}{}^{10}C_{6}+^{5}C_{5}{}^{10}C_{5}=875\)।