Logical Reasoning – Number Series/Model Questions

Look at the following series: What number should come next?

1. 21, 18, 15, 12…
2. 1, 4, 9, 16, 25…
3. 5, 7, 10, 14…
4. 1, 8, 27, 64…
5. 99, 88, 77, 66…
6. 5, 25, 125, 625…
7. 45, 42, 39, 36…
8. 5, 12, 6, 13…
9. 14, 27, 40, 53…
10. 7, 12, 17, 22…
11. 3, 6, 12, 24…
12. 1, 3, 6, 10….
13. 0, 1, 1, 2, 3, 5, 8….
14. 4, 8, 9, 27, 16…..
15. 1, 3, 7, 15, 31….
16. 4, 8, 16, 32….
17. 15, 22, 29, 36….
18. 31, 29, 27, 25…
19. 300, 275, 250, 225….
20. 13, 39, 117, 351……

Answers:

1. 9
2. 36
3. 19
4. 125
5. 55
6. 3125
7. 33
8. 7
9. 66
10. 27
11. 48
12. 15
13. 13
14. 64
15. 63
16. 64
17. 43
18. 23
19. 200
20. 1053