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A coin is tossed $9$ times, and at least $7$ of the tosses were heads. How many different sequences of tosses could there have been?

 Feb 23, 2020
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The number of possible sequences is C(9,7) + C(9,8) + C(9,9) = 72 + 9 + 1 = 82.

 Feb 23, 2020

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