Boa tarde!
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Dados:
a1→ -19
r → a2-a1 → -15-(-19) → -15+19 = 4
an → enésimo
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An=a1+(n-1)·r
an=-19+(n-1)·4
an=-19+4n-4
an=-23+4n → enésimo termo
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Att;Guilherme Lima
