(8) अलग-अलग नोटबुकों में से (4) नोटबुकों को मेज पर क्रम से रखने के तरीके कितने हैं?
How many ways are there to arrange (4) notebooks from (8) different notebooks on a table in order?
Explanation opens after your attempt
A. (1680)
Concept
This is \({}^{8}P_{4}=8\times7\times6\times5=1680\). Take (4) decreasing factors for (4) positions.
Why this answer is correct
The correct answer is A. (1680). This is \({}^{8}P_{4}=8\times7\times6\times5=1680\). Take (4) decreasing factors for (4) positions.
Exam Tip
यह \({}^{8}P_{4}=8\times7\times6\times5=1680\) है। (4) स्थानों के लिए (4) घटते गुणनखंड लें।
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