If the limiting sum of the series a +ar + ar^2 +......... is x, then show S_n = [x^n - (x-a)^n]/ x^(n-1)

Thanks for any help......

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- Jun 12th 2009, 02:21 AManonymous_mathsAnother Arithmetic series question.....
If the limiting sum of the series a +ar + ar^2 +......... is x, then show S_n = [x^n - (x-a)^n]/ x^(n-1)

Thanks for any help...... - Jun 12th 2009, 03:19 AMmr fantastic