यदि ( \frac{n!}{(n-3)!}=504 ), तो (n) का धनात्मक मान क्या है?
If ( \frac{n!}{(n-3)!}=504 ), what is the positive value of (n)?
Explanation opens after your attempt
C. (9)
Concept
It is (n(n-1)(n-2)=504), and \(9\cdot8\cdot7=504\). In such questions, look for three consecutive decreasing factors.
Why this answer is correct
The correct answer is C. (9). It is (n(n-1)(n-2)=504), and \(9\cdot8\cdot7=504\). In such questions, look for three consecutive decreasing factors.
Exam Tip
यह (n(n-1)(n-2)=504) है और \(9\cdot8\cdot7=504\)। ऐसे प्रश्नों में तीन लगातार घटते गुणक देखें।
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