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Probability and Conditional Probability

SAT Math· difficulty 3/5

A bag has 5 red and 5 blue marbles. Two marbles are drawn without replacement. What is the probability both are red?

  • A

    5/185/18

  • B

    2/92/9

    check_circle
  • C

    1/21/2

  • D

    1/41/4

Explanation

P(both red)=(5/10)×(4/9)=20/90=2/9P(\text{both red}) = (5/10) \times (4/9) = 20/90 = 2/9.

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