3 n 2 1 July 8, 2019 16 32 64 128 3 n 2 18 3 n 2 12 3 n 2 10 N 3 2 16 3 n 1 2 2n 3 n 2 )+ 4 1 3 n 4 )= 2 1 6n 4 N 3 1 2 12 Sn 3 2 n 1 3 n 2 4 2n 1 5 4 3 2 n 1 2 3 n 1 6 Lim 1 2 3 n n2 1 N 3 l 2 ml =- 1 1 n 3 2 converge