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2. A coin has 1/4 chance of having heads, 3/4 chance of having tails. It is tossed n times. a) What is the expected number
2. A coin has 1/4 chance of having heads, 3/4 chance of having tails. It is tossed n times. a) What is the expected number of coin tosses needed to get a heads? b) What is the probability that the number of heads equals the number of tails? Write the expression using (3;) notation
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