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A faircoin is tossed until one of the 2 sides occurs twice is row. Probability that even number of tosses required is. |
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Answer» <P>`1/3` B={TT, THTT, THTHTT,…} P(A) = P(B) = `1/4 + 1/16 + …………. " to" propto =1/3` `P(A cup B) = 1/3 + 1/3 = 2/3` |
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