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How many ways are there to choose a monitor and assistant monitor from (10) students?(10) विद्यार्थियों में से मॉनिटर और सह-मॉनिटर चुनने के तरीके कितने हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (90)(90)
There are two distinct posts, so ({}^{10}P_{2}=10\times9=90). Order matters for different designations.दो अलग पद हैं इसलिए ({}^{10}P_{2}=10\times9=90)। अलग designation में order महत्त्वपूर्ण होता है।
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