In how many ways 4 books can be chosen from 8 different books and be arranged in 4 spaces on a bookshelf?

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Step-by-step explanation:

3*2 * 1 = 24 ways . It is called arrangement or permutations, while if you need to group some objects it is called combination and there we need to consider unique groups only.

y > 1/3x

y < = -x + 4

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