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= O COUNTING AND PROBABILITY Introduction to permutations and combinations Suppose we want to choose 2 objects, without replacement, from the 5 objects pencil, eraser,

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= O COUNTING AND PROBABILITY Introduction to permutations and combinations Suppose we want to choose 2 objects, without replacement, from the 5 objects pencil, eraser, desk, chair, and lamp. (a) How many ways can this be done, if the order of the choices is relevant? X 5 (b) How many ways can this be done, if the order of the choices is not relevant

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