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n=10
r =2
mm
_ _ _ _ _ _ _ a8 _ _
an = a8 * r^n-1
an= 768×2^3-1
an= 3072
3072 =a1 ×r^n-1
3072=a1×2^10-1
3072=a1 ×512
a1= 6 entonces
6 _ _ _ _ _ _ _ 768 _ 3072
sn= ai(r^n-1)/r-1
sn÷ 6(2^10 -1)/2-1
sn=6138
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