In a container, there are x black marbles and y white mar...

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PS · Problem Solving

sub-505

Probability

In a container, there are x black marbles and y white marbles. A marble is selected at random from the container and not put back. Then, another marble is selected at random from the remaining marbles. What is the probability that the first marble selected is black and the second marble selected is white?

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A

\frac{x}{x+y}*\frac{y}{x+y-1}

B

\frac{x}{x+y}*\frac{x-1}{x+y-1}

C

\frac{xy}{x+y}

D

\frac{x-1}{x+y}*\frac{y-1}{x+y}

E

\frac{x}{x+y}*\frac{y}{x+y}

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