the sum of n terms of an AP is $\displaystyle 3n^2 +5$. Find the number of terms which equals $\displaystyle 159.$

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- May 6th 2010, 07:15 PMbanku12AP prob
the sum of n terms of an AP is $\displaystyle 3n^2 +5$. Find the number of terms which equals $\displaystyle 159.$

- May 6th 2010, 09:53 PMmathaddict