Let $a$ and $b$ be positive real numbers such that $a + b = 1.$  Find set of all possible values of $\frac{1}{a} + \frac{1}{b}.$
Question:
Let $a$ and $b$ be positive real numbers such that $a + b = 1.$  Find set of all possible values of $\frac{1}{a} + \frac{1}{b}.$
Answer:
Let's think step by step.

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[4,\infty)
Let $a$ and $b$ be positive real numbers such that $a + b = 1.$  Find set of all possible values of $\frac{1}{a} + \frac{1}{b}.$
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