यदि (n>3) और (\frac{(n+1)!}{(n-2)!}=120) है तो (n) का मान क्या है?
If (n>3) and (\frac{(n+1)!}{(n-2)!}=120) then what is the value of (n)?
Explanation opens after your attempt
A. (4)
Concept
After cancellation we get (n(n-1)(n+1)=120) and (n=4) satisfies it. In exams write consecutive factors first.
Why this answer is correct
The correct answer is A. (4). After cancellation we get (n(n-1)(n+1)=120) and (n=4) satisfies it. In exams write consecutive factors first.
Exam Tip
हर को काटने पर (n(n-1)(n+1)=120) मिलता है और (n=4) संतुष्ट करता है। परीक्षा में पहले क्रमागत गुणनखंड लिखें।
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