9. Let $a, b, c, d \in \mathbb{R}$ such that $a < b$ and $c < d$. Prove that $[c, d] \subseteq (a, b) \iff a < c < d < b$
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Step 1: We need to prove that [c, d] ⊆ (a, b) if and only if a < c < d < b. Show more…
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