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I'm having problems with this question: You plan on simultaneously throwing seven fair coins. If you...

I'm having problems with this question:

You plan on simultaneously throwing seven fair coins. If you get at least twice as many heads as tails, you’ll stop; otherwise, you’ll throw all seven coins again. How many throws do you expect it will take to stop?

I know I'm supposed to use the complement of something but I'm unsure how to start.

Math   Statistics-And-Probability   
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