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the sum of n terms of an AP is . Find the number of terms which equals

Quote: Originally Posted by banku12 the sum of n terms of an AP is . Find the number of terms which equals hi T_n=a+(n-1)d=159 ---1 We need to find a and d . a=S1=3(1)^2+5=8 =9 so a=8 , and the common difference , d=1 . Now substitute into 1 to find n .