The math system is telling I'm missing ONE step, but for all the cereal in the world I cannot figure out WHAT STEP!? A bag contains 10 marbles:2 are green, 2 are red, and 6 are blue. Dale chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that both...
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answers:
!!! say: 2/10x1/9=2/90 or 1/45
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kxdesignz say: THANK YOU ALL...ESPECIALLY FOR SHOWING THE STEPS! Now I see where I went wrong! YOU ALL ROCK!!!!!
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derfram say: 2/10 * 1/9 = 2/90
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BlueChief say: 2/10
1/9
2/10 * 1/9 =2/90 =1/45
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nbsale say: You start with 10 marbles.
P(1st is green) = 2/10 = 1/5
P(2nd is green | 1st was green) = 1/9
P(both are green) is 1/5 x 1/9 = 1/45
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Ash say: !st pick
P(green marble) = green marbles / total marbles = 2/10 = 1/5
2nd pick.
P(green marble) = green marbles left / total marbles left = 1/9
P(green marbles) = 1/5 x 1/9 = 1/45
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Second say: 1st pull: 2/10
2nd pull: 1/9
Overall: 1/45
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