The probability that the outfit consists entirely of the same color if the components are chosen at random
= P(outfit color is black) + P(outfit color is blue)
= P(pant = black, shirt = black, shoe = black) + P(pant = blue, shirt = blue, shoe = blue)
= [P(pant = black)*P(shirt = black)*P(shoe = black) ]+ [P(pant = blue)*P(shirt = blue)*P(shoe = blue)]
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