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Probability and Conditional Probability

SAT Math· difficulty 3/5

A bag contains 3 red, 4 blue, and 5 green marbles. What is the probability of drawing a red OR blue marble?

  • A

    3/123/12

  • B

    1/21/2

  • C

    7/127/12

    check_circle
  • D

    4/124/12

Explanation

Red or blue: (3+4)/12=7/12(3 + 4)/12 = 7/12.

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