Question: I need help with homework problems. Our teacher told us to watch a youtube video to help us understand mutually exclusive and non mutually exclusive

I need help with homework problems. Our teacher told us to watch a youtube video to help us understand mutually exclusive and non mutually exclusive events but I need to understand the process. Here are two questions from the 19 she gave us. I think once I understand the process I can finish my homework.

P(A) = 1/4 P(B)=2/5 P(A or B) = 11/20

How do I determine if A & B are mutually exclusive?

P(B)=3/10 P(A or B)=3/4 P(A)=?

Find the missing probability

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