यदि \(^{n}C_{r}=^{n}C_{r-2}\) और (r>2) है, तो (n) किसके बराबर है?
If \(^{n}C_{r}=^{n}C_{r-2}\) and (r>2), then (n) is equal to what?
Explanation opens after your attempt
A. (2r-2)
Concept
For same (n), the complementary indices add to (n). Hence (r+(r-2)=n).
Why this answer is correct
The correct answer is A. (2r-2). For same (n), the complementary indices add to (n). Hence (r+(r-2)=n).
Exam Tip
समान (n) में सूचकांकों का योग (n) होता है। इसलिए (r+(r-2)=n)।
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