यदि ( \frac{(n!)2}{(n-2)!(n+2)!}=\frac{10}{21} ), तो (n) का मान क्या है?
If ( \frac{(n!)2}{(n-2)!(n+2)!}=\frac{10}{21} ), what is the value of (n)?
Explanation opens after your attempt
B. (5)
Concept
The simplified form is ( \frac{n(n-1)}{(n+1)(n+2)} ). Putting (n=5) gives \( \frac{20}{42}=\frac{10}{21} \).
Why this answer is correct
The correct answer is B. (5). The simplified form is ( \frac{n(n-1)}{(n+1)(n+2)} ). Putting (n=5) gives \( \frac{20}{42}=\frac{10}{21} \).
Exam Tip
सरल रूप ( \frac{n(n-1)}{(n+1)(n+2)} ) है। (n=5) रखने पर \( \frac{20}{42}=\frac{10}{21} \) मिलता है।
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