When x approaches 1, find the limit of (x ^ n-1) / (x-1)

(x^n-1)/(x-1)
=(x－1)[x^(n－1)＋x^(n－2)＋x^(n－3)＋… ＋x³＋x²＋1]/(x-1)
=[x^(n－1)＋x^(n－2)＋x^(n－3)＋… ＋x³＋x²＋1]
=1+1+1+...+1
=n

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