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In an exam, in how many ways can first, second and third ranks be obtained among (5) students?किसी परीक्षा में (5) विद्यार्थियों में से प्रथम, द्वितीय और तृतीय स्थान कितने तरीकों से मिल सकते हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (60)(60)
The three ranks are ordered, so ({}^{5}P_{3}=60). In rank questions, use permutation, not combination.तीन rank क्रम वाले हैं इसलिए ({}^{5}P_{3}=60)। rank वाले प्रश्नों में combination नहीं, permutation लें।
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