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analizando
tiros dobles: ===> 6 tiros dobles
11
22
33
44
55
66
tiros nulos ====> 15 tiros nulos
12
13 23
14 24 34
15 25 35 45
16 26 36 46 56
total de posibles tiros = 6 +15 = 21
6/21 = 2/7
la probabilidad es de 2/7 o 6/21
Suerte ;-)