सूत्र \(^{n}C_r=\frac{^{n}P_r}{r!}\) में (r!) से भाग क्यों दिया जाता है?
Why do we divide by (r!) in \(^{n}C_r=\frac{^{n}P_r}{r!}\)?
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Correct Answer
D. क्योंकि क्रम को हटाना होता हैBecause order has to be removed
Concept
In combination order is not counted so (r!) orders of selected objects are removed. In exams treat combination as selection without order.
Why this answer is correct
The correct answer is D. क्योंकि क्रम को हटाना होता है / Because order has to be removed. In combination order is not counted so (r!) orders of selected objects are removed. In exams treat combination as selection without order.
Exam Tip
Combination में क्रम नहीं गिना जाता इसलिए चुनी गई (r) वस्तुओं के (r!) क्रम हटते हैं। परीक्षा में combination को बिना क्रम का चयन मानें।
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