8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?

XXIV, XX, __, XII, VIII. What number should fill the blank?

Find the missing term, 4, 9, 25, ?, 121, 169, 289, 361

Find out the wrong term: 125, 126, 124, 127, 123, 129

Find the missing term: 125, 80, 45, 20, ?

Find the missing term: 5760, 960, ?, 48, 16, 8

201, 202, 204, 207, ... What number should come next?

Find the missing term: 28, 33, 31, 36, ?, 39

Find the missing term: 1, 2, 6, 7, 21, 22, 66, 67, ?