Find the missing term :- 3, 15, ?, 63, 99, 143

Find out the wrong term: 89, 78, 86, 80, 85, 82, 83

15, __, 27, 27, 39, 39. What number should fill the blank?

13, 29, 15, 26, 17, 23, 19, ... choose which pair of numbers comes next?

Find the missing term: 13, 35, 57, 79, 911, ?

40, 40, 31, 31, 22, 22, 13, ... choose which pair of numbers comes next?

Find the missing term: 589654237, 89654237, 8965423, 965423, ?

What will come at the place of question mark ?<br>4, 8, 10, 14, 16, 20, ?

Find the missing term: 24, 60, 120, 210, ?