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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.)

 Jul 14, 2021
 #1
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$\binom{4}{1, 2, 3, 4}$

 Jul 14, 2021

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