$\mathrm{A}$ die is thrown. If $\mathrm{E}$ is the event $'$ the number appearing is a multiple of $3'$ and $F$ be the event $'$ the number appearing is even $^{\prime}$ then find whether $E$ and $F$ are independent ?
$\mathrm{A}$ die is thrown. If $\mathrm{E}$ is the event $'$ the number appearing is a multiple of $3'$ and $F$ be the event $'$ the number appearing is even $^{\prime}$ then find whether $E$ and $F$ are independent ?
We know that the sample space is $S=\{1,2,3,4,5,6\}$
Now $ \mathrm{E}=\{3,6\}, \mathrm{F}=\{2,4,6\}$ and $\mathrm{E} \cap \mathrm{F}=\{6\}$
Then $P(E)=\frac{2}{6}=\frac{1}{3}, P(F)=\frac{3}{6}=\frac{1}{2}$ and $P(E \cap F)=\frac{1}{6}$
Clearly $\mathrm{P}(\mathrm{E} \cap \mathrm{F})=\mathrm{P}(\mathrm{E}) . \mathrm{P}(\mathrm{F})$
Hence $E $ and $F$ are independent events.
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- [IIT 1999]
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