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r - reszka
o - orzeł
Zdarzenie że wypadną minimum 2 reszki:
A = (r,r,r,r) , (r,r,r,o) , (r,r,o,r) , (r,o,r,r) , (o,r,r,r) , (r,r,o,o) , (r,o,r,o) , (r,o,o,r) , (o,r,o,r) (o,o,r,r) , (o,r,r,o)
|A| = 11