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Topic: Some good old fasioned dice probability
Replies: 1   Last Post: Dec 16, 2009 9:43 AM

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Posts: 1
From: Boston
Registered: 12/15/09
Some good old fasioned dice probability
Posted: Dec 15, 2009 6:01 PM
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I sat down to figure this out and realized that since I haven't done any real math since college, I just can't remember how to do this. Hopefully someone can give me some insight so I can run with it.

I've got a handful of standard 6-sided dice numbered 1-6

If I roll X dice, how many are going to show AT LEAST 1 "6".
How about at least 2 sixes?
How about at least 3 sixes?

For showing at least 1 "6" was easy (I remembered that at least). But for showing at least 2 (or more) "6"s is where I got lost.

Would it be easier to determine how many dice are showing exactly 1,2,3,..,n sixes then add the values together for any set of dice? That doesn't sound right.

Anyway - thoughts, insight, or just some pointing toward a bit of reading would be wonderful. Thanks!

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