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?

Probability of choosing a red or a blue marble is 51 / 87

Number of red marble = 27

Number of blue marble = 24

Number of yellow marble = 36

Probability of choosing a red or a blue marble

Computation:

Total number of marble = 27 + 24 + 36

Total number of marble = 87

probability of choosing a red = 27 / 87

probability of choosing a blue = 24 / 87

Probability of choosing a red or a blue marble = [(27 / 87) + (24 / 87)]

Probability of choosing a red or a blue marble = 51 / 87

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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

idk

step-by-step explanation:

2nd one in the first row is correct