(^{n}P_r=^{n}P_{r-1}(n-r+1)) में नया factor क्या दर्शाता है?
What does the new factor represent in (^{n}P_r=^{n}P_{r-1}(n-r+1))?
Explanation opens after your attempt
A. (r)वें स्थान के विकल्पChoices for the (r)th position
Concept
After filling the first (r-1) positions (n-r+1) choices remain for the (r)th position. In exams connect recurrence with the next-place idea.
Why this answer is correct
The correct answer is A. (r)वें स्थान के विकल्प / Choices for the (r)th position. After filling the first (r-1) positions (n-r+1) choices remain for the (r)th position. In exams connect recurrence with the next-place idea.
Exam Tip
पहले (r-1) स्थान भरने के बाद (r)वें स्थान पर (n-r+1) विकल्प बचते हैं। परीक्षा में recurrence को अगले स्थान के विचार से जोड़ें।
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