\(^{n}C_r=\frac{n}{r},^{n-1}C_{r-1}\) किस व्युत्पत्ति से जुड़ा है?
The formula \(^{n}C_r=\frac{n}{r},^{n-1}C_{r-1}\) is connected with which derivation?
Explanation opens after your attempt
A. एक chosen object को चिह्नित करके double counting करनाDouble counting by marking one chosen object
Concept
In each (r)-selection one of the (r) chosen objects can be marked. In exams understand this relation through marked object counting.
Why this answer is correct
The correct answer is A. एक chosen object को चिह्नित करके double counting करना / Double counting by marking one chosen object. In each (r)-selection one of the (r) chosen objects can be marked. In exams understand this relation through marked object counting.
Exam Tip
हर (r)-selection में (r) chosen objects में से एक चिह्नित हो सकता है। परीक्षा में marked object वाली counting से यह relation समझें।
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