There are 5 red marbles, 3 blue marbles and 2 greeen marbles. If a user chooses to use two marbles,what is the probability that the two marbles will be a different color?
The approach that I used was:
I added the results and came up with 9/45 then when that is simplified I get 1/5.
1-1/5=4/5 this is the result I got but the answer says 31/45 after using the combination approach.
Shouldn't the two approaches bring about the same result? Or did I do something wrong?
Thank you for your kudoses Everyone!!!
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