Determine the number of pairs $(a,b)$ of real numbers such that $10, a, b, ab$ is an arithmetic progression.
Question:
Determine the number of pairs $(a,b)$ of real numbers such that $10, a, b, ab$ is an arithmetic progression.
Answer:
Let's think step by step.

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Determine the number of pairs $(a,b)$ of real numbers such that $10, a, b, ab$ is an arithmetic progression.
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