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Sn=150
Sn= ( an * r - a1 ) / (r - 1) y an = a1 * r∧(n-1)
150r -150 = (a1*r²) *r -5
150r - 150 = 5r³ - 5
150r - 145 = 5r³
30r - 29 = r³
perdón, solo llegué hasta aquí