erhall2730 erhall2730

17-01-2018
Mathematics

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In how many ways can you select two people from a group of 20 if the order of selection is not important?

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Аноним Аноним

17-01-2018

that is 20C2 The number of combinations of 2 from 20

= 20 * 19 / 2*1 = 190 answer

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