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At the end of Playlist 13, you learned about the Ratio Test. The main idea that underlies the Ratio Test is the following. One way
At the end of Playlist 13, you learned about the Ratio Test. The main idea that underlies the Ratio Test is the following. One way to to characterize a geometric series is that the ratio between successive terms is constant. That is, be = ro for all n e N (i.e., _ be is a geometric series) if and only if bo = 1 and b, buti = r for all n E N. We also know that a geometric series _ r converges if and only if |r| 1, then _ an diverges. Hint. Start by using the definition of that limit to show that there is an r > 1 such that, for sufficiently large n, van > r. (c) Prove that if lim Van = L 1 or = oo, then _ on diverges. . If lim
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