(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

So if I wanted to get the chance to get x heads in y flips (x <= y)

I use y choose x / 2^y right?

2. Relevant equations

3. The attempt at a solution

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# Calulate chance to get x heads in y flips

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