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In how many ways can first and second positions be decided among (10) runners?(10) धावकों में से प्रथम और द्वितीय स्थान कितने तरीकों से तय हो सकते हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (90)(90)
Positions are ordered, so (^{10}P_2=10\cdot9=90). In exams, rank or position indicates permutation.स्थान क्रमित हैं, इसलिए (^{10}P_2=10\cdot9=90)। परीक्षा में rank या position आने पर permutation लगाएं।
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