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Question Number 115627 by mohammad17 last updated on 27/Sep/20

Commented by prakash jain last updated on 27/Sep/20

$$\mathrm{P}\left(A\right)+P\left(B\right)+P\left(C\right)=1$$$$P\left(C\right)=x$$$$4x+2x+x=1\Rightarrow x=\frac{1}{7}$$$$P\left(B\right)=2x=2/7$$

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