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If $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are three independent events such that $\mathrm{P}(\mathrm{A})=\mathrm{P}(\mathrm{B})=\mathrm{P}(\mathrm{C})=\mathrm{p}$, then
$\mathrm{P}(\mathrm{At}$ least two of $\mathrm{A}, \mathrm{B}, \mathrm{C}$ occur $)=3 \mathrm{p}^2-2 \mathrm{p}^3$
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$\mathrm{P}(\mathrm{At}$ least two of $\mathrm{A}, \mathrm{B}, \mathrm{C}$ occur $)=3 \mathrm{p}^2-2 \mathrm{p}^3$
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