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formula solution in Clear category for Pearls in the Box by David_Jones
def checkio(marbles, step):
N, W = len(marbles), marbles.count('w')
P = (1 - (1 - 2 * W / N) * (1 - 2 / N) ** (step - 1)) / 2
return round(P, 2)
May 16, 2019
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