¿Perder o ganar, sufrir o gozar, reir o llorar: dos caras de la misma moneda?

La probabilidad de que tirando n monedas salgan exactamente n/2 cara es: 100! / (50! · 50!

· 2^100)? 0,07958923738717… casi el 8% En el caso de 100 tiradas y 500 caras: 1000! / (500!

· 500! · 2^1000)? 0,02522501817836… como un 2,5%.

He usado esto: http://www.ttmath.org/online_calculator para hacer los cálculos.

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