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-11 + -13 + -15 + ...+ -69 .
Entonces aplicamos la fórmula para calcular la Suma de los 30 primeros términos. Saludos.
a3=a1+(3-1)(-2)=-15
a1-4=-15
a1=-15+4
a1=-11
entonce S30=-11-58
S30=-69