Question

Determine o trigésimo termo da P.A (5,11,17,...)

Answer 1

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aⁿ = a¹ + (n - 1)r

Pa = { 5;11;17;...}

r = a² - a¹

r = 11 - 5

r = 6

a³⁰ = 5 + (30 - 1)6

a³⁰ = 5 + 180 - 6

a³⁰ = 180 - 1

a³⁰ = 179 ← Resposta

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Att: MarcosPCV