Hi, sorry can't seem to figure this out..please help me ..? 1+3=4 1+3+9=13 1+3+9 +27 = 40 and so on.. find an expression for this sequence any guidance would help soo much .. so lost!!
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Originally Posted by Dgphru Hi, sorry can't seem to figure this out..please help me ..? 1+3=4 1+3+9=13 1+3+9 +27 = 40 and so on.. find an expression for this sequence any guidance would help soo much .. so lost!! Those are powers of three so this is a geometric series. The sum of the geometric series . Here, a= 1, r= 3.
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