यदि \(^{n}C_r\) को \(^{n-1}C_{r-1}\) से जोड़ा जाए तो सही formula कौन-सा है?
If \(^{n}C_r\) is connected with \(^{n-1}C_{r-1}\) which formula is correct?
Explanation opens after your attempt
Correct Answer
B. \(^{n}C_r=\frac{n}{r},^{n-1}C_{r-1}\)
Concept
Simplifying the factorial form gives the factor \(\frac{n}{r}\). In exams check adjacent upper index identities by ratio.
Why this answer is correct
The correct answer is B. \(^{n}C_r=\frac{n}{r},^{n-1}C_{r-1}\). Simplifying the factorial form gives the factor \(\frac{n}{r}\). In exams check adjacent upper index identities by ratio.
Exam Tip
Factorial form से सरल करने पर \(\frac{n}{r}\) factor आता है। परीक्षा में adjacent upper index identities को ratio से जाँचें।
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