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If you roll 5 standard 6 sided dies, what's the probability that you will get at least three 2s?

I imagine it would be 1 - P(0 twos) - P(1 two) - P(2 twos), but I don't know how to calculate the probability of these.

mdewey
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indieman
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  • This looks like pretty standard bookwork. Is this for some subject, or even just for the purposes of your own study? – Glen_b Oct 21 '13 at 04:22
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    Hint: What's the probability of getting anything but a 2 on a single throw of the die? – naught101 Oct 21 '13 at 05:32
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    A 2-second Google search would have saved you from a 15-second question typing effort: http://math.stackexchange.com/questions/337689/if-you-roll-5-standard-six-sided-dice-whats-the-probability-that-you-get-at – Zhubarb Oct 21 '13 at 08:03
  • Useful information is available on our site through a search. – whuber Oct 21 '13 at 13:45

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