किसी परीक्षा में (5) विद्यार्थियों में से प्रथम, द्वितीय और तृतीय स्थान कितने तरीकों से मिल सकते हैं?
In an exam, in how many ways can first, second and third ranks be obtained among (5) students?
Explanation opens after your attempt
Correct Answer
D. (60)
Concept
The three ranks are ordered, so \({}^{5}P_{3}=60\). In rank questions, use permutation, not combination.
Why this answer is correct
The correct answer is D. (60). The three ranks are ordered, so \({}^{5}P_{3}=60\). In rank questions, use permutation, not combination.
Exam Tip
तीन rank क्रम वाले हैं इसलिए \({}^{5}P_{3}=60\)। rank वाले प्रश्नों में combination नहीं, permutation लें।
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