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Here is a link to the question:An arithmetic progression question!!!!!!!!!!?

the first and last terms of an A.P. are a and l respectively. if S be the sum of the terms, then show that the common difference is ( l^2 - a^2 ) / { 2S - (l+a) }

An arithmetic progression question!!!!!!!!!!? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.