Hunterhill
Hunterhill
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April 18th, 2021 at 11:35:11 AM permalink
I was in a drawing 7 times,each time I had a one in ten chance of winning the top prize. I won the top prize 3 times. What were the odds of that happening.
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ThatDonGuy
ThatDonGuy
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WTflush
April 18th, 2021 at 12:35:04 PM permalink
The odds of it happening exactly three times = (1/10)^3 x (9/10)^4 x C(7,3) = about 1 / 43.5.

The odds of it happening at least three times = about 1 / 39.
Hunterhill
Hunterhill
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April 18th, 2021 at 12:39:10 PM permalink
Quote: ThatDonGuy

The odds of it happening exactly three times = (1/10)^3 x (9/10)^4 x C(7,3) = about 1 / 43.5.

The odds of it happening at least three times = about 1 / 39.

Thanks ThatDonGuy
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