(1) से (25) तक की संख्याओं में से (5) संख्याएं चुननी हैं ताकि कोई दो लगातार न हों। कितने चयन होंगे?

Choose (5) numbers from (1) to (25) so that no two are consecutive. How many selections are possible?

Explanation opens after your attempt
Correct Answer

D. (20349)

Step 1

Concept

For non-consecutive selection, use \(^{n-r+1}C_{r}\). Here \(^{21}C_{5}=20349\).

Step 2

Why this answer is correct

The correct answer is D. (20349). For non-consecutive selection, use \(^{n-r+1}C_{r}\). Here \(^{21}C_{5}=20349\).

Step 3

Exam Tip

गैर-लगातार चयन के लिए सूत्र \(^{n-r+1}C_{r}\) है। यहां \(^{21}C_{5}=20349\)।

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Mathematics Answer, Explanation and Revision Hints

(1) से (25) तक की संख्याओं में से (5) संख्याएं चुननी हैं ताकि कोई दो लगातार न हों। कितने चयन होंगे? / Choose (5) numbers from (1) to (25) so that no two are consecutive. How many selections are possible?

Correct Answer: D. (20349). Explanation: गैर-लगातार चयन के लिए सूत्र \(^{n-r+1}C_{r}\) है। यहां \(^{21}C_{5}=20349\)। / For non-consecutive selection, use \(^{n-r+1}C_{r}\). Here \(^{21}C_{5}=20349\).

Which concept should I revise for this Mathematics MCQ?

For non-consecutive selection, use \(^{n-r+1}C_{r}\). Here \(^{21}C_{5}=20349\).

What exam hint can help solve this Mathematics question?

गैर-लगातार चयन के लिए सूत्र \(^{n-r+1}C_{r}\) है। यहां \(^{21}C_{5}=20349\)।