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coin that shows heads with probability 1/3 is tossed. Find the probability that; a) At most 2 heads are obtained in 12 tosses. b) The

coin that shows heads with probability 1/3 is tossed. Find the probability that; a) At most 2 heads are obtained in 12 tosses. b) The first head is obtained on the 4th toss. c) The 4th head is obtained on the 9th toss d) An even number of tosses are required to obtain the first head

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