Say I have a simple Bayes Net that appears like that in the picture and am giving the following probabilities:

$P(y|x) = 0.5$



$P(z|\bar{x}) = 0.9 $

Bayes Net

How would I calculate the following, or is it not possible to calculate them? I think I need to know $P(x)$ to be able to calculate them:


$P(x|y \land z)$



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