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In four throws with a pair of dice, what is the chance of throwing doubles at least twice?

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Do you have any thoughts? Do you know what the chance of throwing doubles in one throw is? On two successive throws? – Ross Millikan Apr 26 '11 at 18:38
Yes,i do.I got stuck in this prob and so i asked. – user10095 Apr 26 '11 at 21:14
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I haven't down-voted this question (yet...), but would suspect that others have because you just asked a question without showing any effort whatsoever. – The Chaz 2.0 Apr 26 '11 at 21:54

2 Answers

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Hint: First, calculate the probability of getting doubles in one throw (What is the number of incidents?), then at least once in four throws (again, count the good incidents and divide by total) and at the end you will get your answer.

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up vote 2 down vote

Here is your answer: binomial distribution at Wikipedia.

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