यदि (\frac{(n+1)!+n!}{(n-1)!}=120) है तो (n) का मान क्या है?
If (\frac{(n+1)!+n!}{(n-1)!}=120) then what is the value of (n)?
Explanation opens after your attempt
C. (10)
Concept
This gives (n(n+2)=120). From \(10\times12=120\), (n=10).
Why this answer is correct
The correct answer is C. (10). This gives (n(n+2)=120). From \(10\times12=120\), (n=10).
Exam Tip
यह (n(n+2)=120) देता है। \(10\times12=120\) से (n=10) मिलता है।
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