PrecalculusMediumSequences, Series, and the Binomial Theorem ShareSequences, Series, and the Binomial Theorem · Medium problemEvaluate the infinite geometric series ∑k=1∞3(−25)k−1\displaystyle\sum_{k=1}^{\infty} 3\left(-\tfrac{2}{5}\right)^{k-1}k=1∑∞3(−52)k−1 (it converges because ∣r∣<1|r|<1∣r∣<1).Check Show answer Walk through it step by step Practice more like this Review this concept