(1) से (20) तक की संख्याओं में से (4) संख्याएं चुननी हैं ताकि कोई दो लगातार न हों। कितने चयन संभव हैं?
Choose (4) numbers from (1) to (20) so that no two are consecutive. How many selections are possible?
Explanation opens after your attempt
Correct Answer
C. (3876)
Concept
If no two are consecutive, use \(^{n-r+1}C_{r}\). Here \(^{17}C_{4}=2380\), so the correct answer is (2380).
Why this answer is correct
The correct answer is C. (3876). If no two are consecutive, use \(^{n-r+1}C_{r}\). Here \(^{17}C_{4}=2380\), so the correct answer is (2380).
Exam Tip
कोई दो लगातार न हों तो सूत्र \(^{n-r+1}C_{r}\) है। यहां \(^{17}C_{4}=2380\), इसलिए सही विकल्प (2380) है।
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