Evaluate the limit $\lim_{x\to\infty }\left(x^{\left(k-1\right)}e^{-ax}\right)$ by replacing all occurrences of $x$ by $\infty $
Any expression multiplied by infinity tends to infinity, in other words: $\infty\cdot(\pm n)=\pm\infty$, if $n\neq0$
Apply the formula: $n^{- \infty }$$=0$, where $n=e$
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