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How do I find the correct answer for the two blanks?

How do I find the correct answer for the two blanks?-example-1
User Frobbit
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\begin{gathered} (P^(\prime)R^(\prime))/(PR)=(3-1)/(6-2)=(2)/(4)=(1)/(2) \\ \\ (P^(\prime)S^(\prime))/(PS)=(5-1)/(10-2)=(4)/(8)=(1)/(2) \end{gathered}

User Exa
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