\({}^{n}C_r=\frac{n}{r}{}^{n-1}C_{r-1}\) की counting व्याख्या क्या है?
What is the counting interpretation of \({}^{n}C_r=\frac{n}{r}{}^{n-1}C_{r-1}\)?
Explanation opens after your attempt
A. पहले एक marked member चुनें और फिर बाकी (r-1) चुनेंFirst choose one marked member and then choose remaining (r-1)
Concept
Choose the marked member in (n) ways and remove overcount of (r) possible marks. In exams understand such identities by member marking.
Why this answer is correct
The correct answer is A. पहले एक marked member चुनें और फिर बाकी (r-1) चुनें / First choose one marked member and then choose remaining (r-1). Choose the marked member in (n) ways and remove overcount of (r) possible marks. In exams understand such identities by member marking.
Exam Tip
Marked member को (n) ways में चुनकर (r) possible marks के overcount को हटाते हैं। परीक्षा में member marking से ऐसी identities समझें।
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