S_Dog

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...

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 ......