यदि ( \frac{(n+4)!}{(n+1)!}=990 ), तो (n) का मान क्या है?
If ( \frac{(n+4)!}{(n+1)!}=990 ), what is the value of (n)?
Explanation opens after your attempt
C. (8)
Concept
((n+4)(n+3)(n+2)=990), and \(11\cdot10\cdot9=990\), so (n=7). Match the three consecutive factors carefully.
Why this answer is correct
The correct answer is C. (8). ((n+4)(n+3)(n+2)=990), and \(11\cdot10\cdot9=990\), so (n=7). Match the three consecutive factors carefully.
Exam Tip
((n+4)(n+3)(n+2)=990) और \(12\cdot11\cdot10=1320\) नहीं; \(11\cdot10\cdot9=990\), इसलिए (n=7) है।
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