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Eduardwww [97]
3 years ago
14

Helppppp.. picture attached

Mathematics
1 answer:
tatyana61 [14]3 years ago
6 0
n^2+n\\\\check:\\\\a_1=1^2+1=2\\a_2=2^2+2=6\\a_3=3^2+3=12\\a_4=4^2+4=20
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