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Mathematics, 23.11.2020 01:40 nails4life324

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 matters? (b) how many ways can this be done if the order of the choices does not matter?

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

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