Cuantos elementos hay que combinar de 2 en 2 para que el numero de combinaciones sea 190
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Cⁿ₂=190
n¡/(n-2)¡×2¡ = 190
n¡/(n-2)¡ = 190×2
n(n-1)(n-2)¡/(n-2)¡ = 5×19×2×2
∴n(n-1)=20×19
∴n=20⇒Hay que combinar 20 elemtos de 2 en 2