SOLUTION: There are 40 pieces of building blocks in a bag: 10 each of blue, green, red, and yellow. Two pieces are chosen at random. Identify the probability that both of the pieces chosen a

Algebra ->  Probability-and-statistics -> SOLUTION: There are 40 pieces of building blocks in a bag: 10 each of blue, green, red, and yellow. Two pieces are chosen at random. Identify the probability that both of the pieces chosen a      Log On


   



Question 1035503: There are 40 pieces of building blocks in a bag: 10 each of blue, green, red, and yellow. Two pieces are chosen at random. Identify the probability that both of the pieces chosen are green.

Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
let P be probability
:
P (first block is green) = 10 / 40 = 1/4
:
P (second block is green) = 9 / 39
:
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P (both blocks are green) = (1/4) * (9/39) = 0.0576923 approx 6%
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