Algebra probabilities homework

Hello Jxmaes36. I fear that you have misunderstood the purpose of this site. This is a help site. Please do not post a list of exercises without showing some attempt or asking questions.

For #1 the probability is \(\mathscr{P}(R_1B_2)=\dfrac{4}{12}\cdot\dfrac{8}{11}=?\)
Now you work out the % and post.
 
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