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23 October, 13:56

There are 5 red pens and 10 black pens in a cup. If a person randomly selects 3 of them, what is the probability that they're all the same color?

A. 0.286

B. 0.18

C. 0.264

D. 0.379

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Answers (1)
  1. 23 October, 14:06
    0
    option a)

    0.286

    Step-by-step explanation:

    Given that,

    number of red pens in cup = 5

    number of black pens in cup = 10

    number of pen randomly selected = 3

    There are 5 red pens and 10 black pens. So there are 5 + 10 = 15 pens in all.

    probability of having all red pens = (5/15 x 4/14 x 3/13)

    = 2/91

    probability of having all black pens = (10/15 x 9/14 x 8/13)

    = 24/91

    probability that all pen are of same colour = 24/91 + 2/91

    = 2/7

    ≈ 0.286
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