A father asks his sons to cut their backyard lawn. Since he does not specify which of the three sons is to do the job, each boy tosses a coin to determine the odd person, who must then cut the lawn. In the case that all three get heads or tails, they continue tossing until they reach a decision. Let p be the probability of heads. (a) Find the probability that they reach a decision in less than n tosses. (b) If p = 1/2 what is the minimum number of tosses required to reach a decision with probability 0.95?

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