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Every morning when Tim wakes up, he groggily searches around his sock drawer and picks two socks randomly. If he has 10 gray-bottomed socks and 8 white-bottomed socks in his drawer, what is the probability that he picks a matching pair?

 Dec 9, 2018
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\(\dfrac{10}{18}\dfrac{9}{17} + \dfrac{8}{18}\dfrac{7}{17} = \dfrac{73}{153}\)

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 Dec 9, 2018

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