Respostas

2014-02-11T18:40:10-02:00
Sn = (a1 + an) * n/2

200 = (2 + an) * 10/2

200 = (2 + an) * 5

200 = 10 + 5an

190 = 5an

190/5 = an
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an = 38
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An = A1 + (n-1) * r
38 = 2 + (10-1) * r
38 - 2 = 9r
36 = 9r
36/9 = r
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r = 4
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Pa (..2,6,10,14,18,22,26,30,34,38...)



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