यदि ( \frac{n!}{(n-2)!}=90 ), तो (n) का मान क्या है?
If ( \frac{n!}{(n-2)!}=90 ), what is the value of (n)?
Explanation opens after your attempt
C. (10)
Concept
It gives (n(n-1)=90), so (n=10). Identify the product of two consecutive numbers.
Why this answer is correct
The correct answer is C. (10). It gives (n(n-1)=90), so (n=10). Identify the product of two consecutive numbers.
Exam Tip
यह (n(n-1)=90) देता है, इसलिए (n=10) है। लगातार दो संख्याओं का गुणनफल पहचानें।
Login to save your score, XP, coins and progress.
