Answer:
3, 12, 27,48, 75, 108, 147
Explanation:
12-3 = 9
27-12 = 15 (9+6)
48-27 = 21 (15+6)
75-48 = 27 (21+6)
108-75 = 33 (27+6)
147-108 = 39 (33+6)
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