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The probability of flipping 91 coins and getting a head 91 times in a row is 1/291 or (1/2)91 or 4.039E-28. The (1/2)91 is when there is exactly 91 coin tosses or n = 91. As the number of trials increases so does the probability of at least 1 run of length 91. The average number of coin flips to see 91 in a row is 4.951760157141521e+27
12 over 91 can't be simplified.
x - 12 = 91 - 84x - 12 = 7x = 19
91/156 = (7×13)/(12×13) = 7/12