यदि (\frac{(n+2)!}{n!}=56) हो, तो (n) का मान क्या है?
If (\frac{(n+2)!}{n!}=56), what is the value of (n)?
Explanation opens after your attempt
B. (6)
Concept
((n+2)(n+1)=56), so \(8\cdot7=56\) gives (n=6). Compare with consecutive numbers.
Why this answer is correct
The correct answer is B. (6). ((n+2)(n+1)=56), so \(8\cdot7=56\) gives (n=6). Compare with consecutive numbers.
Exam Tip
((n+2)(n+1)=56), इसलिए \(8\cdot7=56\) से (n=6)। लगातार संख्याओं से तुलना करें।
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