4. Let \{a_n\} be a sequence of real numbers such that $e^{a_n} + na_n = 2$ for all $n$. Show that $\lim_{n \to \infty} n(1 - na_n) = 1$.
Added by Santiago C.
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First, we can rewrite the given equation as e^an = 2 - nan. Show more…
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