(7) अलग-अलग प्रश्नों में से (5) प्रश्नों को उत्तर-पुस्तिका में क्रम से लिखने के कितने तरीके हैं?
In how many ways can (5) questions be written in order from (7) distinct questions?
Explanation opens after your attempt
A. (2520)
Concept
(5) questions are selected and written in order, so \(^{7}P_5=2520\). In exams, if writing order differs, use permutation.
Why this answer is correct
The correct answer is A. (2520). (5) questions are selected and written in order, so \(^{7}P_5=2520\). In exams, if writing order differs, use permutation.
Exam Tip
(5) प्रश्न चुनकर क्रम में लिखने हैं, इसलिए \(^{7}P_5=2520\)। परीक्षा में order of writing अलग हो तो permutation लें।
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