Find out the wrong term: 121, 143, 165, 186, 209

Find the missing term: 1, 4, 10, 22, 46, ?

Find the missing term: 1, 2, 3, 6, 9, 18, ?, 54

Find the missing number: 11<sup>1</sup>/<sub>9</sub>, 12<sup>1</sup>/<sub>2&l…

2, 44, 4, 41, 6, 38, 8, ... choose which pair of numbers comes next?

Find the missing term: 3, 10, 101, ?

10, 34, 12, 31, 14, 28, 16, ... choose which pair of numbers comes next?

In the series 2, 6, 18, 54, ...., what will be the 8th term ?

Find the missing term: 13, 32, 24, 43, 35, ?, 46, 65, 57, 76