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hallando r la diferencia:
a15 = a1 + 14r
27 = -1 +14r
28 = 14r
2 = r
hallando la suma
S15 = [(a1 + an)(n)]/2
S15 = [(-1 + 27)(15)]/2
S15 = (26*15)/2
S15 = 195 que es la respuesta