4. Find an expression for the power series and then use the ratio test to find the interval of convergence. 4x2 8x3 16x4 32x5 1 + 2x + + + ... .. 2! + + 3! 4! 5!irections: Determine the radius and interval of convergence of the following series. xn n =1 2n - 1 " (-1)n xn 7= 0 Vn # 3 (-1)n xn n2 n= 1