यदि ( \frac{(n+2)!}{n!}-\frac{(n+1)!}{(n-1)!}=18 ), तो (n) का मान क्या है?
If ( \frac{(n+2)!}{n!}-\frac{(n+1)!}{(n-1)!}=18 ), what is the value of (n)?
Explanation opens after your attempt
Correct Answer
B. (8)
Concept
The simplified form is (2(n+1)), so (2(n+1)=18) and (n=8). Simplify the expression first.
Why this answer is correct
The correct answer is B. (8). The simplified form is (2(n+1)), so (2(n+1)=18) and (n=8). Simplify the expression first.
Exam Tip
सरल रूप (2(n+1)) है, इसलिए (2(n+1)=18) और (n=8)। पहले अभिव्यक्ति को सरल करें।
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