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So why would not use the formula he gave at the bottom? That is how he gets his answer.
Is it anywhere in the 7th edition?
Do you have the book? It is on page 431 of the sixth edition and he gives 3 examples after the derivation.
On which page is that?
How are you getting (4n+6)/3?
I'm not understanding their examples.. I had to find help on Bayes' from youtube -- book does not even mention using a tree to simplify things..
I do not know about the 7th edition but the 6th edition has the answer to this problem just a few pages away!
Yes, that's correct.
It would not be the first time -- it is Prob 7.4 #9 from Discrete Math (rosen 7th ed)
Well, for the second problem, the book is wrong.