(8) अलग-अलग प्लेटों में से (2) प्लेटों को ऊपरी और निचले रैक में रखने के तरीके कितने हैं?
How many ways are there to place (2) plates from (8) different plates on the upper and lower racks?
Explanation opens after your attempt
A. (56)
Concept
The upper and lower racks are distinct, so \({}^{8}P_{2}=56\). Order is counted for distinct positions.
Why this answer is correct
The correct answer is A. (56). The upper and lower racks are distinct, so \({}^{8}P_{2}=56\). Order is counted for distinct positions.
Exam Tip
ऊपरी और निचला रैक अलग हैं इसलिए \({}^{8}P_{2}=56\)। अलग स्थानों में order गिना जाता है।
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