Question: Hello, I have a question that I thought I set up correctly but it was marked wrong. Please help me to understand the correct way

Hello,

I have a question that I thought I set up correctly but it was marked wrong. Please help me to understand the correct way to set up the following problem:

"Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability that both marbles are white.

Thank you.

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