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a1 = 10
n = 10
an = 5120
r = ?
an = a1 * rⁿ⁻¹
5120 = 10 * r¹⁰⁻¹
5120 = 10 * r⁹
r⁹ = 5120 / 10
r⁹ = 512
r = 2
Ahora:
a1 = 10
r = 2
n = 5
an = ?
an = a1 * rⁿ⁻¹
an = 10 * 2⁵⁻¹
an = 10 * 2⁴
an = 10 * 16
an = 160 ; respuesta.
buena suerte..