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2014-06-03T21:32:02-03:00
Sn=(a1+an)n/2
Sn=35
N=an=14
35=(a1+14)14/2
35=14a1+196/2
2x35=14a1+196
70=14a1+196
196-70=14a1
126=14a1
A1=126/14
A1=9
2 3 2