किस स्थिति में \(n^r\) formula \(^{n}P_r\) की जगह आता है?
In which situation does the formula \(n^r\) replace \(^{n}P_r\)?
Explanation opens after your attempt
Correct Answer
A. जब repetition allowed हो और order important होWhen repetition is allowed and order is important
Concept
Each of the (r) positions has (n) independent choices. In exams do not write a decreasing product when repetition is allowed.
Why this answer is correct
The correct answer is A. जब repetition allowed हो और order important हो / When repetition is allowed and order is important. Each of the (r) positions has (n) independent choices. In exams do not write a decreasing product when repetition is allowed.
Exam Tip
हर (r) स्थान पर (n) choices स्वतंत्र रूप से रहती हैं। परीक्षा में repetition allowed हो तो decreasing product नहीं लिखें।
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