mathrm{A} die is thrown. If mathrm{E} is event ' number appearing is a multiple of 3'

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14.Probability

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$\mathrm{A}$ 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 ?

Option A

Option B

Option C

Option D

Solution

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.

Standard 11

Mathematics

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