I need help with this critical thinking (probability question)?

Question

1.You have a jar of 120 marbles--30 are red, 40 are blue, and 50 are yellow. If you have two picks with replacement, what is your chance of getting either one red marble and one blue marble or one red marble and one yellow marble?

Answer

You have 120 marbles and 30 are red, so the odds of picking a red marble are 30 in 120 which equals 1/4. 

You have 120 marbles and 90 are either yellow or blue, so the odds are 90 in 120 which equals 3/4.

The odds of getting both conditions are 1/4 x 3/4 = 3/16.

I need help with this critical thinking (probability question)?

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