\(^{n}C_r\) और \(^{n}C_{r-1}\) के बीच कौन-सा अनुपात सही है?
Which ratio between \(^{n}C_r\) and \(^{n}C_{r-1}\) is correct?
Explanation opens after your attempt
Correct Answer
B. \(\frac{^{n}C_r}{^{n}C_{r-1}}=\frac{n-r+1}{r}\)
Concept
Simplifying the factorial formula gives the ratio \(\frac{n-r+1}{r}\). In exams ratio method is useful for adjacent combinations.
Why this answer is correct
The correct answer is B. \(\frac{^{n}C_r}{^{n}C_{r-1}}=\frac{n-r+1}{r}\). Simplifying the factorial formula gives the ratio \(\frac{n-r+1}{r}\). In exams ratio method is useful for adjacent combinations.
Exam Tip
Factorial formula से सरल करने पर अनुपात \(\frac{n-r+1}{r}\) मिलता है। परीक्षा में adjacent combinations में ratio method उपयोगी है।
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