\(^{n}P_r\) में (r=2) रखने पर कौन-सा result मिलता है?
What result is obtained by putting (r=2) in \(^{n}P_r\)?
Explanation opens after your attempt
A. (n(n-1))
Concept
For two ordered positions the choices are (n) and (n-1). In exams treat \(^{n}P_2\) as the ordered pair formula.
Why this answer is correct
The correct answer is A. (n(n-1)). For two ordered positions the choices are (n) and (n-1). In exams treat \(^{n}P_2\) as the ordered pair formula.
Exam Tip
दो क्रमबद्ध स्थानों के लिए choices (n) और (n-1) हैं। परीक्षा में \(^{n}P_2\) को ordered pair formula मानें।
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