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What's the probability that the ball you remove is red if you added a red ball from bag A?

2/5

am i right? @Jemurray3

1/5

Lastly, what's the probability that you picked a red marble from bag A? Or a blue one?

1/2

or 3/6

yes

yea i know that but the part i didnt understand is why are we multiplying 1/2 with each possibility

Because that's the probability of choosing a red or blue marble from bag A to begin with.

ok its is but why multiplying

@jim_thompson5910 read and just answer my last comment plz

ohh thanx it was very helpful @Jemurray3