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**Unformatted text preview: *** letting a=n in sum a x^n; a can't depend on n * moving n out of a sum: sum n x^n cannot become n * sum x^n * ending up with an n in the final answer, similar to a definite integral of f(x) dx; shouldn't have an x in answer * not estimating/doing LB/UB: try first few terms of sum to see the general value you should end up with. * On the other hand, don't rely solely on partial sum calculations! For example, what if your partial sums are 0.0769 + 0.0386 + 0.0256 + 0.0192 + 0.0154 + . .. does that converge? You can't tell just by looking! (these terms happen to be 1/(13n) , so will the sum converge? no, it's (1/13) times the Harmonic Series)...

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