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24-08-2017
Mathematics

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A box contains 10 pairs of shoes (20 shoes in total). if two shoes are selected at random, what is the probability that they are matching shoes?

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apologiabiology apologiabiology

24-08-2017

once you've selected 1 shoe, there are 19 shoes left
1 shoe will be correct
18 will be wrong

so 1/19 that you get a matching pair

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