Question

Write in Summation Notation:

Answer 1

1/9 + 1/16 + 1/25 + 1/36 + .........
I know it has something to do with a square in the denominator..

Answer 2

1/n^2 , from 3-infinity

Answer 3

\[\sum_{1}^{\infty}1/(n+2)^{2}\]

Answer 4

\[\sum_{n=3}^{\infty} \frac{1}{n^2} \]

Answer 5

yeah

Answer 6

which one?

Answer 7

both are same

Answer 8

oh okay thank you :)

Answer 9

what about for 1 - 1/3 + 1/5 - 1/7 +.......

Answer 10

\[\sum_{n=0}^{\infty} (-1)^n \frac{1}{2n+1}\]

Answer 11

and 125/9 + 625/16 + 3,125/25 + 15,625/36 . I know the bottom is n^2 but what's the top?

Answer 12

the top are factgorials im fairly sure

Answer 13

5!, 6! etc

Answer 14

\[\sum_{n=3}^{ \infty} \frac{ (n+2)!}{n^2} \]

Answer 15

wait, thats not right :|

Answer 16

yeah

Answer 17

its multiples of 5 on the top

Answer 18

its powers of 5

Answer 19

5^n / n^2

Answer 20

thats it

Answer 21

n=3 to infinity

Answer 22

\[\sum_{n=3}^{\infty} 5^n \frac{5^2}{n^2} \]

Answer 23

\[\sum_{n=3}^{\infty} \frac{5^{n+2}}{n^2}\]

Answer 24

ur wrong mate

Answer 25

if it starts from 3 then its 5^n

Answer 26

no, thats not it :|

Answer 27

yeh whatever

Answer 28

?

Answer 29

\[\sum_{n=3}^{\infty}5^{n}/n ^{2}\]

Answer 30

thats ur answer

Answer 31

you're right ! Thanks :D Saved me

Answer 32

no prob...

Answer 33

hey could you look at myt problem pleaseeee