Random Patriotism

Discrete Mathematics Level pending

You have a bag containing 15 red beads; 15 white beads and 15 blue beads. You randomly select one bead at a time and place each one end to end on a table. What is the probability that the first nine beads you withdraw will be -in order- red, white, blue, red, white, blue, red, white, blue. Express in percent.

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