यदि \(^{n}C_{5}:^{n}C_{4}=11:5\) है, तो (n) का मान क्या है?
If \(^{n}C_{5}:^{n}C_{4}=11:5\), what is the value of (n)?
Explanation opens after your attempt
B. (15)
Concept
\(\frac{^{n}C_{5}}{^{n}C_{4}}=\frac{n-4}{5}\). Equating it to \(\frac{11}{5}\) gives (n=15).
Why this answer is correct
The correct answer is B. (15). \(\frac{^{n}C_{5}}{^{n}C_{4}}=\frac{n-4}{5}\). Equating it to \(\frac{11}{5}\) gives (n=15).
Exam Tip
\(\frac{^{n}C_{5}}{^{n}C_{4}}=\frac{n-4}{5}\) होता है। इसे \(\frac{11}{5}\) के बराबर रखने पर (n=15)।
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