(\frac{(n+1)!}{(n-2)!}) का सही विस्तार कौन सा है?
Which is the correct expansion of (\frac{(n+1)!}{(n-2)!})?
Explanation opens after your attempt
Correct Answer
B. ((n+1)n(n-1))
Concept
((n+1)!=(n+1)n(n-1)(n-2)!). After canceling ((n-2)!), ((n+1)n(n-1)) remains.
Why this answer is correct
The correct answer is B. ((n+1)n(n-1)). ((n+1)!=(n+1)n(n-1)(n-2)!). After canceling ((n-2)!), ((n+1)n(n-1)) remains.
Exam Tip
((n+1)!=(n+1)n(n-1)(n-2)!) होता है। इसलिए समान ((n-2)!) कटने पर ((n+1)n(n-1)) बचता है।
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