<PRE><B>Question 135627</B>
In a Box I have (2 red balls, 3 white balls, and 5 green balls).  What is the probability of picking the same color twice?  Please show me how to calculate this.
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P(2red or 2white or 2green) = P(2red) + P(2white) + P(2green)
= 2C2/10C2 + 3C2/10C2 + 5C2/10C2

= (1 + 3 + 10)/45 

= 14/45

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Cheers,
Stan H.</PRE>