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A stack contains 7 green marbles and 3 red marbles. 2 marbles are taken from the sack w/out replacement. What is the probability of taking one green marble and one red marble (in any order)?

 May 9, 2022
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A stack contains 7 green marbles and 3 red marbles. 2 marbles are taken from the sack w/out replacement. What is the probability of taking one green marble and one red marble (in any order)?

 

P(Green followed by Red)  =  \(\frac{7}{10}*\frac{3}{9}=\frac{21}{90}\)

 

Now do something very similar to get the prob of a red followed by a green.

 

Then add the answers together and simplify.

 May 10, 2022

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