5/3 + 15/3 + 25/3 +....(10n-5)/3 = 125/3
solve for n
actually i know the what answer is
i wondering which way you prefer to solve for this
Thanks best regards
Last edited by blackjack21; Nov 5th 2012 at 02:56 AM.
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sum of an arithmetic series ...
the second term is 15/13 or 15/3 ?
The left side is an arithmetic series with first term , . . common difference , and terms.
Its sum is: .
Originally Posted by pickslides the second term is 15/13 or 15/3 ? sorry my fault i fixed you right its 3
thanx for the two diffrent solution better for me
Thanks and best regards
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