Question

Claude has 2 jars of marbles. Each jar has 10 blue marbles and 10 green marbles. He selects 2 marbles from each jar. What is the probability that they are all blue ? ( Enter answers as fractions when possible and the final answer rounded to the nearest thousandth, please )

Answer 1

Wouldn't it be 10/20 or 1/2? 0.5 in decimal form

Answer 2

It is given in the question that

Claude has 2 jars of marbles. Each jar has 10 blue marbles and 10 green marbles. He selects 2 marbles from each jar.

Selecting 2 blue marbles out of 10 blue marbles is

`10C 2 = 45`

And selecting 2 marbles out of 20 marbles is

`20C2 =190`

Therefore probability of selecting 2 blue marble each from the two jars is

`(45)/(190)*2 = 0.474`