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formulas para el curso de matematica
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u = t1 + = ( n - 1) d
S = (t1 + u)n2
S = [ 2t1 + (n -1) d ]n2u = t1 r
n-1
S = t1( r n - 1 )
r - 1Para r>1
S = t1( 1 - r n )
1 - rPara r