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mafiozo [28]
3 years ago
9

WILL GIVE BRAINLIEST

Mathematics
2 answers:
NemiM [27]3 years ago
6 0
15, 18, 21

i don't know the other one, sorry
Harlamova29_29 [7]3 years ago
5 0
15, 18, 21 (add 3)

It is geometric
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