I watch lastly a lottery game : there are 80 numbers, from them 20 are selected, and you can choose for example to find 7 numbers out of the 20.(adsbygoogle = window.adsbygoogle || []).push({});

I'm looking for the probability to find 7 numbers, is it simply C(80,7)/C(80,20) or is it 20!/13!/C(80,20) or C(80,13)/C(80,20) ?

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# Lottery probability

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