A simplified model for the movement of the price of a stock supposes that on each day
Question:
(a) What is the probability that after 2 days the stock will be at its original price?
(b) What is the probability that after 3 days the stock’s price will have increased by 1 unit?
(c) Given that after 3 days the stock’s price has increased by 1 unit, what is the probability that it went up on the first day?
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