यदि ( \frac{(2n)!}{(2n-3)!}=720 ), तो (n) का मान क्या है?
If ( \frac{(2n)!}{(2n-3)!}=720 ), what is the value of (n)?
Explanation opens after your attempt
Correct Answer
A. (5)
Concept
It is ((2n)(2n-1)(2n-2)=720). Since \(10\cdot9\cdot8=720\), (2n=10) and (n=5).
Why this answer is correct
The correct answer is A. (5). It is ((2n)(2n-1)(2n-2)=720). Since \(10\cdot9\cdot8=720\), (2n=10) and (n=5).
Exam Tip
यह ((2n)(2n-1)(2n-2)=720) है। \(10\cdot9\cdot8=720\), इसलिए (2n=10) और (n=5)।
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