Number on the Bottom
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Answer: 30 18 48 66
From 3rd Row onwards, the numbers are the sums of corresponding numbers of the two previous rows. (3 + 8 = 11, 6 + 2 = 8, 9 + 10 = 19, 15 + 12 = 27 and so on.)
| 3 | 6 | 9 | 15 |
| 8 | 2 | 10 | 12 |
| 11 (3+8) | 8 (6+2) | 19 (9+10) | 27 (15+12) |
| 19 (8+11) | 10 (2+8) | 29 (10+19) | 39 (12+27) |
| 30 (11+19) | 18 (8+10) |
48 (19+29) | 66 (27+39) |
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