anonymous
  • anonymous
. Find the sum.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
of?
anonymous
  • anonymous
\[\sum_{100}^{n=1}7n\]
anonymous
  • anonymous
how do you do this?

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anonymous
  • anonymous
waittt this is backwardsss
anonymous
  • anonymous
good question im sorry i cnt help you love
Zarkon
  • Zarkon
\[\sum_{n=1}^{k}an=a\frac{k(k+1)}{2}\]
anonymous
  • anonymous
\( \sum \limits_{100}^{n=1}7n \); is meaningless but \( \sum \limits_{n=1} ^{100}7n \) is an arithmetic progression.
anonymous
  • anonymous
\( \huge \sum \limits_{n=1} ^{100}7n = 35350 \)
anonymous
  • anonymous
thank you foolformath! but how exactly did you do this?
anonymous
  • anonymous
See, Zarkon's answer.
Zarkon
  • Zarkon
\[7\frac{100(100+1)}{2}=35350\]
anonymous
  • anonymous
so if i had this equation,\[\sum_{n=1}^{100}2n\] my answer would be 10100 am i right?
Zarkon
  • Zarkon
yes
anonymous
  • anonymous
ohhh ok thanks!

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