Your best friend is holding a black and a white marble, and asks you to open your

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Your best friend is holding a black and a white marble, and asks you to open your hands and close your eyes.

(a) He deposits one marble in each of your hands, and asks you to close your hands before you open your eyes.What is the probability that the marble in your right hand is black?

(b) He asks you to open your left hand, and there you see a black marble.
What is now the probability that themarble in your right hand is black?

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