1. Let X be the number of times that no heads appear on two coins when these two coins are tossed together n times. Find the smallest value of n so that Pr (0.24 <>X / n <>0.26) 0.954, approximately.
2. Two persons have 16 and 32 dollars, respectively. They bet one dollar on each of 900 independent tosses of an un biased coin. What is an approximation to the probability that neither person is in debt at the end of the 900 trials?