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Three boys P,Q and R are to speak at a function along with 5 others. If all of them speak in random order, what is the probability that P speaks before Q and Q speaks before R?


$( A ) \large\frac{1}{9} \\ ( B ) \large\frac{2}{3} \\ ( C ) \large\frac{1}{3} \\ ( D ) \large\frac{1}{6}$

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