an = 3n² - 2n + 1
a9 = 3*9² - 2*9 + 1 = 3*81 - 18 + 1 = 226
pronto
Deve ser 15
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an = 3n² - 2n + 1
a9 = 3*9² - 2*9 + 1 = 3*81 - 18 + 1 = 226
pronto
Deve ser 15