\lim _ { x \rightarrow 2 } \frac { x ^ { n } - a ^ { n } } { x - 2 } = – InterviewSolution

1.	\lim _ { x \rightarrow 2 } \frac { x ^ { n } - a ^ { n } } { x - 2 } = 80 \text { and } n \in N , \text { find } n
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