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a=primer termino q es 1
d=diferencia o razón 2-1=1, 3-2=1
d=1
L=n/2 (2a+(n-1)d)
L=876/2 (2+(875)*1)
L=438(877)
L=384126
= (1 + 876) + (2 + 875) + (3 + 874) + (4 + 873) + (...) + (...) (438 términos)
= 877 + 877 + 877 + 877 +..................... (438 términos)
= 877 x 438
= 384126
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