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An urn contains 27 red marbles, 24 blue marbles, and 36 yellow marbles. One marble is to be chosen from the urn without looking. What is the probability of choosing a red or a blue marble?

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  1. 6 July, 13:26
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    31%

    Step-by-step explanation:

    27 + 24 + 36=87 27/87=.31 31%
  2. 6 July, 13:47
    0
    Step-by-step explanation:

    Total number of marbles = 27+24+36=87

    P of choosing a red marble=27/87

    P of choosing a blue marble=24/87

    P (R or B) = 27/87 * 24/87

    =9/29*8/29 (both figures are already the smallest fraction)

    =0.31*0.276

    P=0.085
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