Given two real numbers $p>1$ and $q>1$ so that $\frac{1}{p} + \frac{1}{q} = 1$, what is the value of $(p-1)(q-1)$?
Question:
Given two real numbers $p>1$ and $q>1$ so that $\frac{1}{p} + \frac{1}{q} = 1$, what is the value of $(p-1)(q-1)$?
Answer:
Let's think step by step.

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Given two real numbers $p>1$ and $q>1$ so that $\frac{1}{p} + \frac{1}{q} = 1$, what is the value of $(p-1)(q-1)$?
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