यदि ( \frac{(n+2)!}{(n-1)!}-\frac{(n+1)!}{(n-2)!}=216 ), तो (n) का मान क्या है?
If ( \frac{(n+2)!}{(n-1)!}-\frac{(n+1)!}{(n-2)!}=216 ), what is the value of (n)?
Explanation opens after your attempt
D. (8)
Concept
The simplified form is (3n(n+1)), so (n(n+1)=72). Since \(8\cdot9=72\), (n=8).
Why this answer is correct
The correct answer is D. (8). The simplified form is (3n(n+1)), so (n(n+1)=72). Since \(8\cdot9=72\), (n=8).
Exam Tip
सरल रूप (3n(n+1)) है, इसलिए (n(n+1)=72)। \(8\cdot9=72\), इसलिए (n=8)।
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