Mathematics, 18.03.2021 01:10 marelinatalia2000

Suppose we want to choose 2 letters, without replacement, from the 4 letters A, B, C, and D. (a) How many ways can this be done, if the order of the choices is relevant? (b) How many ways can this be done, if the order of the choices is not relevant?

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Suppose we want to choose 2 letters, without replacement, from the 4 letters A, B, C, and D. (a) How...

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