यदि ( \frac{(n+3)!-(n+2)!}{(n+1)!}=49 ), तो (n) का मान क्या होगा?
If ( \frac{(n+3)!-(n+2)!}{(n+1)!}=49 ), what will be the value of (n)?
Explanation opens after your attempt
D. (5)
Concept
The expression becomes ((n+2)2), so ((n+2)2=49) and (n=5). Simplify the subtraction first.
Why this answer is correct
The correct answer is D. (5). The expression becomes ((n+2)2), so ((n+2)2=49) and (n=5). Simplify the subtraction first.
Exam Tip
अभिव्यक्ति ((n+2)2) बनती है, इसलिए ((n+2)2=49) और (n=5)। पहले घटाव को सरल करें।
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