For Sigma-summation Underscript n = 1 Overscript infinity StartFraction 0.9 Superscript n Baseline Over 3 EndFraction, find S4=
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If Sigma-summation Underscript n = 1 Overscript infinity StartFraction 0.9 Superscript n Baseline Over 3 EndFraction = 3, the truncation error for S4 is
.