Question Number 115627 by mohammad17 last updated on 27/Sep/20
Commented by prakash jain last updated on 27/Sep/20
$$\mathrm{P}\left({A}\right)+{P}\left({B}\right)+{P}\left({C}\right)=\mathrm{1} \\ $$$${P}\left({C}\right)={x} \\ $$$$\mathrm{4}{x}+\mathrm{2}{x}+{x}=\mathrm{1}\Rightarrow{x}=\frac{\mathrm{1}}{\mathrm{7}} \\ $$$${P}\left({B}\right)=\mathrm{2}{x}=\mathrm{2}/\mathrm{7} \\ $$