You randomly draw a marble from a bag of marbles that contains 3 blue marbles, 4 green marbles, and 5 red marbles.
What is P(draw a blue marble)?

1/4 of a chance to draw a blue marble

You have 1/4 chance to draw blue.

There are 3 blue marbles out of 12 marbles total which is 3/12. Simplify this and it equals 1/4.

I hope this explanation helps you understand this problem better.

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