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18 December, 04:50

Your friend who has tickets to a concert and who selects 2 of them at random to give to you, but assume that your friend has 15 tickets of which 5 are in the front row and 10 are in the tenth row. (1) what is the probability that both of the tickets you receive are in the front row

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  1. 18 December, 05:10
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    There are 15*14/2 = 105 ways to choose 2 tickets from 15.

    There are 5*4/2 = 10 ways to choose 2 tickets from 5.

    The probability that two tickets randomly selected are both front-row tickets is ...

    ... 10/105 = 2/21.
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