Break this down for me why is it 2/9 and not 1/3? if you reach in and grab 2 marble there are only 3 option 2 red, 2 blue, or one of each .
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Break this down for me why is it 2/9 and not 1/3? if you reach in and grab 2 marble there are only 3 option 2 red, 2 blue, or one of each .
The first marble has to be red (probability: 1/2) and the second marble has to be red (probability: 4/9). The probability that both marbles are red, is obtained by 1/2 * 4/9 (multiplication rule of probability) = 4/18 = 2/9.
Very neat, Thank you. I have learn my something new for today.