( \frac{(2n)!}{(2n-4)!} ) का सही विस्तार कौन सा है?
Which is the correct expansion of ( \frac{(2n)!}{(2n-4)!} )?
Explanation opens after your attempt
Correct Answer
B. ((2n)(2n-1)(2n-2)(2n-3))
Concept
We expand ((2n)!) up to ((2n)(2n-1)(2n-2)(2n-3)(2n-4)!). Therefore four factors remain.
Why this answer is correct
The correct answer is B. ((2n)(2n-1)(2n-2)(2n-3)). We expand ((2n)!) up to ((2n)(2n-1)(2n-2)(2n-3)(2n-4)!). Therefore four factors remain.
Exam Tip
((2n)!) को ((2n)(2n-1)(2n-2)(2n-3)(2n-4)!) तक फैलाते हैं। इसलिए चार गुणक बचते हैं।
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