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An urn contains 3 black balls and 4 white balls. Two are drawn at random. balls from the box one by one and without replacement.

An urn contains 3 black balls and 4 white balls. Two are drawn at random. balls from the box one by one and without replacement. What is the probability that:

a) both balls are black?

b) the second ball is black?

c) only one of the two balls is black?

d) if two balls are drawn from the urn one by one and with replacement.

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