यदि \( \binom{12}{r}=\binom{12}{r+2} \), तो ( r ) का मान क्या है?
If \( \binom{12}{r}=\binom{12}{r+2} \), what is the value of ( r )?
Explanation opens after your attempt
Correct Answer
A. (5)
Concept
By symmetry, (r+(r+2)=12), so (r=5). In such questions, make the lower indices add to (n).
Why this answer is correct
The correct answer is A. (5). By symmetry, (r+(r+2)=12), so (r=5). In such questions, make the lower indices add to (n).
Exam Tip
सममिति से (r+(r+2)=12), इसलिए (r=5) है। ऐसे प्रश्नों में निचले सूचकांकों का योग (n) के बराबर रखें।
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