(9) अलग-अलग पेनड्राइव में से (2) पेनड्राइव को पहले और दूसरे स्लॉट में लगाने के तरीके कितने हैं?
How many ways are there to place (2) pen drives from (9) different pen drives in the first and second slots?
Explanation opens after your attempt
D. (72)
Concept
There are (9) choices for the first slot and (8) for the second, so (72). Count permutation when slots are distinct.
Why this answer is correct
The correct answer is D. (72). There are (9) choices for the first slot and (8) for the second, so (72). Count permutation when slots are distinct.
Exam Tip
पहले स्लॉट के लिए (9) और दूसरे के लिए (8) विकल्प हैं इसलिए (72)। स्लॉट अलग हों तो permutation गिनें।
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