Saylilbaby
  • Saylilbaby
help pls
Mathematics
chestercat
  • chestercat
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Saylilbaby
  • Saylilbaby
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  • Saylilbaby
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anonymous
  • anonymous
\[\sum_{n=3}^{8}5n=15+20+25+30+35+40=?\]

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welshfella
  • welshfella
you just need to add up the above numbers
welshfella
  • welshfella
use ur calculator
Saylilbaby
  • Saylilbaby
what about the last one? @welshfella
anonymous
  • anonymous
\[\sum_{n=1}^{ \infty }-4\left( \frac{ 1 }{ 3 } \right)^{n-1}\] a. put n=1,2,3,4 b.& C.\[S=\frac{ -4 }{ 1-\frac{ 1 }{ 3 } }=-4 \times \frac{ 3 }{ 2 }=-6\] which is finite so it converges.

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