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16 December, 19:17

A bag contains 14 red marbles and 6 blue marbles. two marbles are randomly drawn without replacement. find the probability that both marbles are red

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  1. 16 December, 19:34
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    We take 2 marbles from 20 marbles and the total ways is 20x19:2=190

    But we need only 2 red marbles and the ways is 14x13:2=91

    And finally we do the division 91:190=91/190 is the probability we need
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