Use of Sigma

**jordangiscool** · July 20th 2009, 07:18 PM

I NEED HELPPPPP.....

4
E 6/j^2
j=1

i keep on getting 51/4 whats my mistake?
heres the equation i got s = 4(6+3/8) / 2

im not asking for answers...as you can see i already got the equation but i keep on getting the wrong answer

**mr fantastic** · July 20th 2009, 07:22 PM

Originally Posted by jordangiscool

I NEED HELPPPPP.....

4
E 6/j^2
j=1

i keep on getting 51/4 whats my mistake?
heres the equation i got s = 4(6+3/8) / 2

By definition:

$\sum_{j = 1}^{4} \frac{6}{j^2} = \frac{6}{1^2} + \frac{6}{2^2} + \frac{6}{3^2} + \frac{6}{4^2} = \, ....$

**songoku** · July 20th 2009, 07:43 PM

that's not an arithmetic progression

**Grandad** · July 21st 2009, 05:32 AM

Hello songoku

Originally Posted by songoku

that's not an arithmetic progression

Correct! What made you think it was?

Grandad

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