किस derivation में \(^{n}P_r\) को \(n^r\) से बदलना गलत होगा?
In which derivation would replacing \(^{n}P_r\) by \(n^r\) be wrong?
Explanation opens after your attempt
Correct Answer
A. जब repetition not allowed हो और order important होWhen repetition is not allowed and order is important
Concept
Without repetition, choices decrease, so \(^{n}P_r\) is needed. In exams do not apply powers without reading the repetition condition.
Why this answer is correct
The correct answer is A. जब repetition not allowed हो और order important हो / When repetition is not allowed and order is important. Without repetition, choices decrease, so \(^{n}P_r\) is needed. In exams do not apply powers without reading the repetition condition.
Exam Tip
Without repetition में choices घटती हैं, इसलिए \(^{n}P_r\) चाहिए। परीक्षा में repetition condition पढ़े बिना power न लगाएं।
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