Use the Ratio Test to determine the convergence or divergence of the series. If the Ratio Test is inconclusive, determine the convergence or divergence of the series using other methods. (If you need to use co or -co, enter INFINITY INFINITY, respectively.) (-1)" 4 . 8 . 12 ... (4n) n = 1 4 . 9 . 14 . . . (50 - 1) lim an + 1 7-+ 00 an O converges O diverges