यदि ( \frac{(n+1)!}{(n-1)!}=42 ), तो (n) का धनात्मक मान क्या है?
If ( \frac{(n+1)!}{(n-1)!}=42 ), what is the positive value of (n)?
Explanation opens after your attempt
Correct Answer
B. (6)
Concept
It gives (n(n+1)=42), so (n=6). Convert factorial ratios into consecutive products.
Why this answer is correct
The correct answer is B. (6). It gives (n(n+1)=42), so (n=6). Convert factorial ratios into consecutive products.
Exam Tip
यह (n(n+1)=42) देता है, इसलिए (n=6) है। फैक्टोरियल अनुपात को लगातार गुणनफल में बदलें।
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