यदि \(^{n}C_{r+1}=\frac{n-r}{r+1},^{n}C_r\) है तो यह संबंध किस ratio से निकला है?
If \(^{n}C_{r+1}=\frac{n-r}{r+1},^{n}C_r\) then this relation is derived from which ratio?
Explanation opens after your attempt
Correct Answer
B. \(\frac{^{n}C_{r+1}}{^{n}C_r}=\frac{n-r}{r+1}\)
Concept
Writing factorial forms and canceling common terms gives the ratio. In exams ratio method is fast for consecutive combinations.
Why this answer is correct
The correct answer is B. \(\frac{^{n}C_{r+1}}{^{n}C_r}=\frac{n-r}{r+1}\). Writing factorial forms and canceling common terms gives the ratio. In exams ratio method is fast for consecutive combinations.
Exam Tip
Factorial form लिखकर common terms cancel करने से ratio मिलता है। परीक्षा में consecutive combinations में ratio method तेज होता है।
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