pre calculus

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A bag contains 4 blue marbles, 2 black marbles, and 3 red marbles. If a marble is randomly drawn from the bag, what is probability that it is not black?

1/2
2/9
5/9
7/9
14/19

  • pre calculus -

    since 2 of the 9 marbles are black,

    p(~black) = 1-p(black) = 1-2/9 = 7/9

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