Mathematical Reasoning - Number Series
19. Fill in the missing number in the following arrangement based on some principle.
| 8 | 6 | 4 |
| 3 | ? | 7 |
| 14 | 16 | 18 |
- Option : B
- Explanation : In first row, it is −2; in second row, it is +2, and in third row, it is +2.
20. Find the missing number in the following series.
8, 24, 12, ?, 18, 54
- Option : C
- Explanation : Multiply the first by 3 and divide the number so obtained by 2. This is to be done alternatively for all other numbers
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