यदि ( \frac{(2n)!}{(2n-4)!}=1680 ), तो (n) का मान क्या है?
If ( \frac{(2n)!}{(2n-4)!}=1680 ), what is the value of (n)?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
It is ((2n)(2n-1)(2n-2)(2n-3)=1680). Since \(8\cdot7\cdot6\cdot5=1680\), (n=4).
Why this answer is correct
The correct answer is B. (4). It is ((2n)(2n-1)(2n-2)(2n-3)=1680). Since \(8\cdot7\cdot6\cdot5=1680\), (n=4).
Exam Tip
यह ((2n)(2n-1)(2n-2)(2n-3)=1680) है। \(8\cdot7\cdot6\cdot5=1680\), इसलिए (n=4)।
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