Dado a P.A. (7,10,13,16,..) calcule o S13 eo S20
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an = a1+(n-1)r
a13 = 7 +(13-1)3
a13 = 7+36
a13=43
s13=(a1 + an).n/2
s13=(7+43).13/2
s13=650/2
s13=325
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an = a1+(n-1)r
a20 = 7 +(20-1)3
a20 = 7+57
a20=64
s13=(a1 + an).n/2
s13=(7+64).20/2
s13=1420/2
s13=710
a13 = 7 +(13-1)3
a13 = 7+36
a13=43
s13=(a1 + an).n/2
s13=(7+43).13/2
s13=650/2
s13=325
------------------------------
an = a1+(n-1)r
a20 = 7 +(20-1)3
a20 = 7+57
a20=64
s13=(a1 + an).n/2
s13=(7+64).20/2
s13=1420/2
s13=710
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s20=(7+64).20/2
s20=1420/2
s20=710 ******