( \frac{(n+2)!}{(n-1)!} ) किसके बराबर है?
What is ( \frac{(n+2)!}{(n-1)!} ) equal to?
Explanation opens after your attempt
Correct Answer
A. (n(n+1)(n+2))
Concept
((n+2)!=(n+2)(n+1)n(n-1)!), so three factors remain. Do not forget to expand down to the denominator.
Why this answer is correct
The correct answer is A. (n(n+1)(n+2)). ((n+2)!=(n+2)(n+1)n(n-1)!), so three factors remain. Do not forget to expand down to the denominator.
Exam Tip
((n+2)!=(n+2)(n+1)n(n-1)!), इसलिए तीन गुणक बचते हैं। हर तक विस्तार करना न भूलें।
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