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Ω=espacio muestral
A=muestra
⇒ Ω=(1,2.3.4.5...28,29,30)=n(Ω)=30
A=(4,8,12,16,20,24,28)=n(A)=7
finalmente divides n(A)/n(Ω)=7/30
ese es la probabilidad: "7 de 30"