The probability of NOT getting heads is (1/2)4=1/16
Therefore the probability of getting heads is 1-1/16=15/16
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1/4
If the coin is fair, the probability is 1/4.
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
50/50