\(^{11}P_2\) और \(^{11}C_2\) का संबंध कौन-सा है?
What is the relation between \(^{11}P_2\) and \(^{11}C_2\)?
Explanation opens after your attempt
Correct Answer
B. \(^{11}P_2=2\times{}^{11}C_2\)
Concept
Because (2!=2) and \(^{n}P_2=^{n}C_2\times2!\). In exams remember the factor (2) when (r=2).
Why this answer is correct
The correct answer is B. \(^{11}P_2=2\times{}^{11}C_2\). Because (2!=2) and \(^{n}P_2=^{n}C_2\times2!\). In exams remember the factor (2) when (r=2).
Exam Tip
क्योंकि (2!=2) और \(^{n}P_2=^{n}C_2\times2!\) है। परीक्षा में (r=2) पर factor (2) याद रखें।
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