(10) विद्यार्थियों में से मॉनिटर और सह-मॉनिटर चुनने के तरीके कितने हैं?
How many ways are there to choose a monitor and assistant monitor from (10) students?
Explanation opens after your attempt
A. (90)
Concept
There are two distinct posts, so \({}^{10}P_{2}=10\times9=90\). Order matters for different designations.
Why this answer is correct
The correct answer is A. (90). There are two distinct posts, so \({}^{10}P_{2}=10\times9=90\). Order matters for different designations.
Exam Tip
दो अलग पद हैं इसलिए \({}^{10}P_{2}=10\times9=90\)। अलग designation में order महत्त्वपूर्ण होता है।
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