17, 17, 34, 20, 20, 31, 23, ... choose which pair of numbers comes next?
19, 2, 38, 3, 114, 4, ? . Which term should replace the question mark in this series ?
2 : 0 :: 4 : ?
2, 1, 1/2, 1/4, . . . . . . What number should come next?
2, 15, 41, 80, ? . Complete the series.
2, 2, 4, 6, ?, 10, 8, 14, 10
2, 3, 4, 5, 6, 4, 8, ... choose which pair of numbers comes next?
2, 4, 6, 8, 10, ... What number should come next?
2, 6, 18, 54, ... What number should come next?
2, 8, 14, 20, 26, 32, 38, ... choose which pair of numbers comes next?
