Probability of Picking Red, Blue, and Red from a Bag without Replacement

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Homework Statement



There is a bag with 20 balls in it. 5 red, 6 green, 9 blue. What is the probability of picking, (without replacement) a red, then a blue, then a red in that order?

Homework Equations





The Attempt at a Solution



(5/20) * (9/19) * (4/18)

Is this correct? Or am I missing something?
 
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