[All Steps] A and B agree to play the following game: at each step a chip is drawn from the urn containing 4 red chips and 3 green chips with replacement.


Question: A and B agree to play the following game: at each step a chip is drawn from the urn containing 4 red chips and 3 green chips with replacement. A wins the game if 4 red chips are drawn consecutively before 3 green chips are drawn consecutively. B wins the game if 3 green chips are drawn consecutively before 4 red chips are drawn consecutively. Fin the probability that A wins the game.

3. A fair coin is tossed 10 times. Let S i = the number of heads - the number of tails after i tosses for i = 1, 2, 3, ...,10. What is the probability that S i is greater than 0 for all i = 1, 2, 3,..., 10?

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