## lilsis76 3 years ago okay umm....how do i do this arithmetic sequence find the sum: pi/3 + 2pi/3 + pi + 4pi/3 +...+13pi/3 how do i do this? im so lost

1. anonymous

ignore the $$\pi$$ and add $\frac{1}{3}+\frac{2}{3}+\frac{3}{3}+...$ or better yet add $1+2+3+...+13$ and the multiply the result by $$\frac{\pi}{3}$$

2. lilsis76

okay let me try it

3. lilsis76

haha im so lost hold on

4. lilsis76

91pi/3 ? @satellite73

5. anonymous

lets see

6. anonymous

yup you got it

7. lilsis76

coool :) now i got another problem on a diff proble m :?