\(^{n}C_r\) के formula में ((n-r)!) denominator क्यों आता है?
Why does ((n-r)!) appear in the denominator of the formula for \(^{n}C_r\)?
Explanation opens after your attempt
A. क्योंकि factorial (n!) में चुनी न गई वस्तुओं की arrangements भी शामिल होती हैंBecause (n!) includes arrangements of unselected objects too
Concept
In the formula (n!) loses both unwanted tail ((n-r)!) and order (r!). In exams understand both parts of the combination denominator.
Why this answer is correct
The correct answer is A. क्योंकि factorial (n!) में चुनी न गई वस्तुओं की arrangements भी शामिल होती हैं / Because (n!) includes arrangements of unselected objects too. In the formula (n!) loses both unwanted tail ((n-r)!) and order (r!). In exams understand both parts of the combination denominator.
Exam Tip
Formula में (n!) से unwanted tail ((n-r)!) और order (r!) दोनों हटते हैं। परीक्षा में combination denominator के दोनों भाग समझें।
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