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a1=5 1/5=(5*5+1)/5=26/5
a2=26/5+r
6=26/5+r
r=6-26/5=(30-26)/5=4/5
an=a1+(n-1)r
18=26/5+(n-1)*4/5
18=26/5+4/5*n-4/5
18=22/5+4/5*n
18-22/5=4/5*n
(18*5-22)/5=4/5*n
90-22=4n
68=4n
n=68/4
n=17
respuesta : son 17 terminos