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Statement of a problem № 2760

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A system consists of 3 coins that can come up either heads or tails. In how many different ways can the system have (a) all heads up? (b) All tails up? (c) One tail and two heads up? (d) Two tails and one head up?

Solution:
A system consists of 3 coins that can come up either heads or tails. In how many

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