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
Correct Answer

A. (2r-2)

Step 1

Concept

For same (n), the complementary indices add to (n). Hence (r+(r-2)=n).

Step 2

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).

Step 3

Exam Tip

समान (n) में सूचकांकों का योग (n) होता है। इसलिए (r+(r-2)=n)।

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Mathematics Answer, Explanation and Revision Hints

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?

Correct Answer: A. (2r-2). Explanation: समान (n) में सूचकांकों का योग (n) होता है। इसलिए (r+(r-2)=n)। / For same (n), the complementary indices add to (n). Hence (r+(r-2)=n).

Which concept should I revise for this Mathematics MCQ?

For same (n), the complementary indices add to (n). Hence (r+(r-2)=n).

What exam hint can help solve this Mathematics question?

समान (n) में सूचकांकों का योग (n) होता है। इसलिए (r+(r-2)=n)।