\(^{n}C_r=\frac{n}{r},^{n-1}C_{r-1}\) में \(\frac{n}{r}\) का विचार किससे जुड़ा है?
In \(^{n}C_r=\frac{n}{r},^{n-1}C_{r-1}\) what is the idea behind \(\frac{n}{r}\)?
Explanation opens after your attempt
A. एक चुनी हुई वस्तु को चिह्नित करके दो तरह से गिननाCounting in two ways by marking one chosen object
Concept
A marked selection can start by choosing one of (n) objects and then choosing the remaining (r-1). In exams identify double counting identities.
Why this answer is correct
The correct answer is A. एक चुनी हुई वस्तु को चिह्नित करके दो तरह से गिनना / Counting in two ways by marking one chosen object. A marked selection can start by choosing one of (n) objects and then choosing the remaining (r-1). In exams identify double counting identities.
Exam Tip
Marked selection को (n) तरीके से शुरू करके बाकी (r-1) चुना जा सकता है। परीक्षा में double counting identities पहचानें।
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