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Find out why the formula we use to work out conditional probabilities is true!
Ok we have that problem and 2 "plausible" answers so make a little trick.
Change the 1 to be a X.
So instead of 6/2(1+2)= you make that 2 equations:
6/2(X+2)=9 and 6/2(X+2)=1. I never reach the obvious X=1 with one of them 🤷♂️