यदि ( \frac{(n+3)!}{n!}-\frac{(n+2)!}{(n-1)!}=270 ), तो (n) का मान क्या है?
If ( \frac{(n+3)!}{n!}-\frac{(n+2)!}{(n-1)!}=270 ), what is the value of (n)?
Explanation opens after your attempt
B. (8)
Concept
The simplified form is (3(n+2)(n+1)), so ((n+2)(n+1)=90). Since \(10\cdot9=90\), (n=8).
Why this answer is correct
The correct answer is B. (8). The simplified form is (3(n+2)(n+1)), so ((n+2)(n+1)=90). Since \(10\cdot9=90\), (n=8).
Exam Tip
सरल रूप (3(n+2)(n+1)) है, इसलिए ((n+2)(n+1)=90)। \(10\cdot9=90\), अतः (n=8)।
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