\(^{n}C_2=\frac{^{n}P_2}{2!}\) में (2!) से भाग का pair-counting अर्थ क्या है?
What is the pair-counting meaning of dividing by (2!) in \(^{n}C_2=\frac{^{n}P_2}{2!}\)?
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Correct Answer
B. हर unordered pair दो orders में गिना गया हैEach unordered pair is counted in two orders
Concept
(AB) and (BA) are the same unordered pair. In exams divide by (2!) when there is no direction.
Why this answer is correct
The correct answer is B. हर unordered pair दो orders में गिना गया है / Each unordered pair is counted in two orders. (AB) and (BA) are the same unordered pair. In exams divide by (2!) when there is no direction.
Exam Tip
(AB) और (BA) एक ही unordered pair हैं। परीक्षा में direction न हो तो (2!) से divide करें।
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