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Determine the probability mass function

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1. Suppose a coin having probability 0.7 of coming up heads is tossed three times. Let X denote the number of heads that appear in the three tosses. Determine the probability mass function of X.

2. A ball is drawn from an urn containing three white and three black balls. After the ball is drawn, it is then replaced and another ball is drawn. This goes on inde?nitely. What is the probability that of the ?rst four balls drawn, exactly two are white?

Reference no: EM131005618

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