यदि ( \frac{(n+4)!}{(n-1)!(n+3)(n+2)}=840 ), तो (n) का मान क्या है?
If ( \frac{(n+4)!}{(n-1)!(n+3)(n+2)}=840 ), what is the value of (n)?
Explanation opens after your attempt
B. (8)
Concept
The simplified form is (n(n+1)(n+4)). Since \(8\cdot9\cdot12=864\), the equation is invalid.
Why this answer is correct
The correct answer is B. (8). The simplified form is (n(n+1)(n+4)). Since \(8\cdot9\cdot12=864\), the equation is invalid.
Exam Tip
सरल रूप (n(n+1)(n+4)) है। \(8\cdot9\cdot12=864\) नहीं, इसलिए समीकरण त्रुटिपूर्ण है।
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