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an=a1+(n-1).r an=8+(10-1)(2.6)
an=8+9.(2.6) an=8+23.4 an=31.4
Ahora suma de n terminos
Sn=(a1+an/2).n°terminos
Sn=(8+31.4/2).10 simplificar 2 y 10 y queda Sn=(39. 4)(5) Sn=197 resp.