2. For which of the following series does the ratio test ensure divergence? Select all that apply. n=1 n=1 8 n=1 n=1 M& n=1 31 + n! 2n + 3 n! 2n! NI (n!)² (2n)! + 13 + 2.5 1.5 en 3.5 3.5.7 1.3 1.3.5 1.3 1.3.5 + 3.5 3.5.7 (n²)! Σ (2n)! n=1 + (n+1) 2n (n + 1)! 1.5 + 2 2.5 2.5.8 1.5.9 + + 1.5.9 2.5.8 + + + + + + + + 1) 2.5.8.(3n- 1.5.9 (4n-3) ... - 3.5.7 (2n+1) 1.3.5... (2n - 1) 1.3.5 (2n-1) 3.5.7 (2n +1) 1.5.9...(4n 3) 2.5.8(3n 1) + + +

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