Question: Find the probability that the second ball was red, given that the first ball was (A) Replaced before the second draw (B) Not replaced before

Find the probability that the second ball was red, given that the first ball was
(A) Replaced before the second draw
(B) Not replaced before the second draw
Problem refer to the following experiment: 2 balls are drawn in succession out of a box containing 2 red and 5 white balk Let Ri be the event that the ith ball is red, and let Wi be the event that the ith ball is white

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