Question 957687: In how many ways could you obtain at least one head if you flip the coin seven times?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! If you flip a coin seven times, there are 2^7 = 128 different outcomes
1 of those outcomes is all tails. So 128-1 = 127 of those outcomes have at least one head.
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