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r=3
a=2
a
a+r
a+2r
a+3r
.
.
a+(n-1)r
na+[(n-1)(n)/2]r=155
2n+[(n^2-n)/2]*3=155
2n+[(3n^2-3n)]/2=155
4n+3n^2-3n=310
3n^2+n=310
n=10
Tiene 10 términos