n=C³₂₀=20!/(3!·(20-3)!)=18·19·20/6=1140
m=5·C²₂₀=5·(20!/(2!·(20-2)!))=950
p=m/n=950/1140=5/60=1/12
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n=C³₂₀=20!/(3!·(20-3)!)=18·19·20/6=1140
m=5·C²₂₀=5·(20!/(2!·(20-2)!))=950
p=m/n=950/1140=5/60=1/12