A bag has four green marbles, three red marbles, and three yellow marbles. What is the probability that you pick a red marble, do not replace it, and pick another red marble?

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1 Answer
Jim G.
May 12, 2018

#1/15#

Explanation:

#"the measure of probability is"#

#•color(white)(x)"total favourable outcomes"/"total possible outcomes"#

#"favourable outcome is red of which there are 3"#

#"total possible outcomes "=4+3+3=10#

#rArrP("red")=3/10#

#color(blue)"red marble is not replaced"#

#"favourable outcome is now 2"#

#"total possible outcomes "=9#

#rArrP("red")=2/9#

#P("red/red")=3/10xx2/9=6/90=1/15#

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