Complete the series: 6, 11, 21, 36, 56, ... ?
Complete the series: 796, 675, 554, 433, ...?....
Complete the series: 8, 31, 122, 485, 1936, 7739, ?
Complete the series: 85 : 40 : : 77 : ?
Complete the series: 9 * 2 : 9 * 9 : : 9 * 5 : ?
Complete the series: A, B , N, C, D, O, E, F, P, ?, ?, ?
Complete the series: A, B, B, D, C, F, D, D, H. E, ?, ?
Complete the series: A, CD, GHI, ? , UVWXY
Complete the series: a, d, c, f, ? , h, g, ? , i
Complete the series: A, D, H, M, ?, Z