यदि ((n+1)! = 72(n-1)!) है तो (n) का मान क्या है?
If ((n+1)! = 72(n-1)!) then what is the value of (n)?
Explanation opens after your attempt
B. (8)
Concept
After cancellation (n(n+1)=72). Since \(8\times9=72\), (n=8).
Why this answer is correct
The correct answer is B. (8). After cancellation (n(n+1)=72). Since \(8\times9=72\), (n=8).
Exam Tip
काटने पर (n(n+1)=72) मिलता है। \(8\times9=72\) इसलिए (n=8) है।
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