\(\frac{^{n}P_r}{^{n}P_{r-1}}\) का सही मान कौन-सा है?
What is the correct value of \(\frac{^{n}P_r}{^{n}P_{r-1}}\)?
Explanation opens after your attempt
Correct Answer
B. (n-r+1)
Concept
When the (r)th position is added the new factor is (n-r+1). In exams the ratio of consecutive permutations gives the last factor.
Why this answer is correct
The correct answer is B. (n-r+1). When the (r)th position is added the new factor is (n-r+1). In exams the ratio of consecutive permutations gives the last factor.
Exam Tip
(r)वें स्थान को जोड़ने पर नया factor (n-r+1) होता है। परीक्षा में consecutive permutations का ratio last factor देता है।
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