\(r{}^{n}C_r=n{}^{n-1}C_{r-1}\) की double counting व्याख्या क्या है?
What is the double-counting interpretation of \(r{}^{n}C_r=n{}^{n-1}C_{r-1}\)?
Explanation opens after your attempt
A. एक चुने हुए (r)-समूह में एक सदस्य को चिह्नित करनाMarking one member in a chosen (r)-group
Concept
The left side chooses a group and marks one member, while the right side chooses the marked member first. In exams treat the factor (r) as a marked choice.
Why this answer is correct
The correct answer is A. एक चुने हुए (r)-समूह में एक सदस्य को चिह्नित करना / Marking one member in a chosen (r)-group. The left side chooses a group and marks one member, while the right side chooses the marked member first. In exams treat the factor (r) as a marked choice.
Exam Tip
बाईं ओर समूह चुनकर mark करते हैं, दाईं ओर marked member पहले चुनते हैं। परीक्षा में (r) factor को marked choice मानें।
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