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5:57 PM
I suggest reading about conditional probabilities, and perhaps also this Open letter to students with homework problemsStef 58 secs ago
 
 
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8:17 PM
If this is a school or book assignment/exercise then please read How do I ask and answer homework questions? as well as Open letter to students with homework problems. Either way please include the full and complete assignment text (copy-pasted as text) in the question itself, together with your attempt (in the form of an minimal reproducible example) and a description of the problems you have with it. — Some programmer dude 13 secs ago
 

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