[QUOTE=mynameistruth;445902

For example, for d, the way I figured to do it is either 1. P((Y2|Y1 is yellow) or (Y2|1st choice is not yellow)) or 2. P((Y2 and Y1) or (Y2 and 1st choice is not yellow))

But I can't figure out what's the difference, and i'm also not sure whether the outer function is or or and? Can someone help me out here?[/QUOTE]

Suppose there is no difference? Write out how you will compute both, they may just give the same result.

CB