A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and...

A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and replaced by two marbles of the opposite colour. Then another marble was drawn and also replaced by two marbles of the opposite color. A third marble was then drawn. Find the probability that the first marble drawn was white if: both the second and third marbles drawn were white.

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orchestra answered 1 year ago

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