# Math Help - Use of Sigma

1. ## Use of Sigma

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

2. 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:

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

3. that's not an arithmetic progression

4. Hello songoku
Originally Posted by songoku
that's not an arithmetic progression
Correct! What made you think it was?