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Mathematics, 10.12.2020 23:30 wowwowumbsi

Suppose we want to choose 2 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 matters?
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. How ma...
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