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grahamroxann
grahamroxann grahamroxann
  • 01-05-2014
  • Mathematics
Answered

a bottle contains 12 red marbles and 8 blue marbles. A marble is chosen at random and not replaced. Then a second marble is chosen at random. Determine the probability that the two marbles are not the same color.

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kate200468
kate200468 kate200468
  • 01-05-2014

\(P(A)= \frac{12}{20} \cdot \frac{8}{19} + \frac{8}{20} \cdot \frac{12}{19}= \frac{12\cdot8}{20\cdot19} \cdot2=\frac{12\cdot4}{5\cdot19}= \frac{48}{95}\)

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