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I was watching this Youtube video on Naive Bayes. The creator begins by using the example of an email spam filter to illustrate how Naive Bayes works. At 5:47, the narrator says that, technically, the probability is proportional to the probability that the message is normal, given that it says "Dear Friend". What exactly does this mean (I know what proportional means in general, but I'm not totally sure what "proportional to the probability that the message is normal" means in this case), and why is this the case?

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