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S_Dog

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You guys....actually try to help out please. Here, make a chart that cascades to the upper-right-most square. Kinda like Pascal's Triangle. 1............. 48639 1................... 1................... 1................... 1 7 25.............. 1 5 13
Well basically, just count how many total combinations there are in the flips. = HHH, HHT, HTH, THH, TTH, THT, HTT, TTT Of those, we find 7 with a tail (we omit HHH from our list). Now with that, we count the ones with at least one head. So..our answer is

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