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Suppose we want to choose 3 letters, without replacement, from the 4 letters A, B, C, and D. How many ways can this be done,

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Suppose we want to choose 3 letters, without replacement, from the 4 letters A, B, C, and D. How many ways can this be done, if the order of the choices is taken into (a) consideration? X (b ) How many ways can this le done, if the order of the choices is not taken into consideration

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