यदि \(^{n}P_2=^{n}C_2\cdot k\) है तो (k) का मान क्या होगा?
If \(^{n}P_2=^{n}C_2\cdot k\), what is the value of (k)?
Explanation opens after your attempt
Correct Answer
B. (2!)
Concept
Each pair can be written in (2!) orders. In exams apply \(^{n}P_r=^{n}C_r r!\) directly.
Why this answer is correct
The correct answer is B. (2!). Each pair can be written in (2!) orders. In exams apply \(^{n}P_r=^{n}C_r r!\) directly.
Exam Tip
हर pair को (2!) orders में लिखा जा सकता है। परीक्षा में \(^{n}P_r=^{n}C_r r!\) तुरंत लगाएं।
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