[tex]|\Omega|=30+5\cdot 30=180\\|A|=15+5\cdot 21=120\\\\P(A)=\dfrac{120}{180}=\dfrac{2}{3}[/tex]
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[tex]|\Omega|=30+5\cdot 30=180\\|A|=15+5\cdot 21=120\\\\P(A)=\dfrac{120}{180}=\dfrac{2}{3}[/tex]