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Alyssa has four marbles: a red one, a blue one, a green one, and a yellow one. In how many different ways can she form a set consisting of some of the marbles if she must choose at least one marble? (In a set of chosen marbles, it does not matter in what order she chose the marbles.)

 Aug 29, 2020
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Counting by the number of marbles there are, there are 12 possible ways that Alyssa can choose.

 Aug 29, 2020

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