How do I ask and answer homework questions?, Why is “Can someone help me?” not an actual question?, Open letter to students with homework problems. — Daniel Langr 45 secs ago

Also please read How do I ask and answer homework questions? as well as Open letter to students with homework problems — Some programmer dude 21 secs ago

I suggest reading about conditional probabilities, and perhaps also this Open letter to students with homework problems — Stef 58 secs ago

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