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r = razon
n = numero d terminos
a1 = primer termino
an = ultimo termino
sn = ((a1+ an)÷2)n an= a1+ (n-1)r
1)
a1 = 15 an= ? r=4 n=8 Sn= ((15+43)÷2)8
a8= 15 + 7(4) RESP. -> Sn= 232
a8= 43
2) a1= 12 an=? r= 6 n=12
a12= 12+ 11(6) Sn= ((12+78)÷2)12
a12= 78 RESP. -> Sn= 540