cherrilyn
  • cherrilyn
Write in Summation Notation:
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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cherrilyn
  • cherrilyn
1/9 + 1/16 + 1/25 + 1/36 + ......... I know it has something to do with a square in the denominator..
anonymous
  • anonymous
1/n^2 , from 3-infinity
anonymous
  • anonymous
\[\sum_{1}^{\infty}1/(n+2)^{2}\]

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anonymous
  • anonymous
\[\sum_{n=3}^{\infty} \frac{1}{n^2} \]
anonymous
  • anonymous
yeah
cherrilyn
  • cherrilyn
which one?
anonymous
  • anonymous
both are same
cherrilyn
  • cherrilyn
oh okay thank you :)
cherrilyn
  • cherrilyn
what about for 1 - 1/3 + 1/5 - 1/7 +.......
anonymous
  • anonymous
\[\sum_{n=0}^{\infty} (-1)^n \frac{1}{2n+1}\]
cherrilyn
  • cherrilyn
and 125/9 + 625/16 + 3,125/25 + 15,625/36 . I know the bottom is n^2 but what's the top?
anonymous
  • anonymous
the top are factgorials im fairly sure
anonymous
  • anonymous
5!, 6! etc
anonymous
  • anonymous
\[\sum_{n=3}^{ \infty} \frac{ (n+2)!}{n^2} \]
anonymous
  • anonymous
wait, thats not right :|
anonymous
  • anonymous
yeah
anonymous
  • anonymous
its multiples of 5 on the top
anonymous
  • anonymous
its powers of 5
anonymous
  • anonymous
5^n / n^2
anonymous
  • anonymous
thats it
anonymous
  • anonymous
n=3 to infinity
anonymous
  • anonymous
\[\sum_{n=3}^{\infty} 5^n \frac{5^2}{n^2} \]
anonymous
  • anonymous
\[\sum_{n=3}^{\infty} \frac{5^{n+2}}{n^2}\]
anonymous
  • anonymous
ur wrong mate
anonymous
  • anonymous
if it starts from 3 then its 5^n
anonymous
  • anonymous
no, thats not it :|
anonymous
  • anonymous
yeh whatever
cherrilyn
  • cherrilyn
?
anonymous
  • anonymous
\[\sum_{n=3}^{\infty}5^{n}/n ^{2}\]
anonymous
  • anonymous
thats ur answer
cherrilyn
  • cherrilyn
you're right ! Thanks :D Saved me
anonymous
  • anonymous
no prob...
anonymous
  • anonymous
hey could you look at myt problem pleaseeee

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