सूत्र (^{n}P_r=n(n-1)(n-2)\cdots(n-r+1)) में कुल कितने गुणनखंड होते हैं?
How many factors are there in (^{n}P_r=n(n-1)(n-2)\cdots(n-r+1))?
Explanation opens after your attempt
Correct Answer
B. (r)
Concept
Since (r) positions are to be filled there are (r) factors. In exams connect the number of factors with the number of positions.
Why this answer is correct
The correct answer is B. (r). Since (r) positions are to be filled there are (r) factors. In exams connect the number of factors with the number of positions.
Exam Tip
क्योंकि (r) स्थान भरने हैं इसलिए (r) गुणनखंड आते हैं। परीक्षा में गुणनखंडों की संख्या को स्थानों की संख्या से जोड़ें।
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