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## Sagot :

H = probability of a tail turning up = 1/2 in one toss

Then P (56 heads or more) =

1/2^100 [ C(100,56) + C(100,57) + C(100,58) + ....

C(100,98) + C(100,99) + C(100,100) ]

where C(N, R) = N ! / [ (N - R)! R! ] number of occurrances of R formed from

N tosses.