Question

Please help with this sigma problem, i think the answer is 10!!

Answer 1

\[\sum_{1}^{3} (3i+1)\]

Answer 2

and I also have this one which is \[\sum_{1}^{2} 3i\]

Answer 3

which i think is 6???

Answer 4

the 1 on the bottom is giving you your starting place and the 3 on the top is telling you how many times to go through it

so for the first on, you have
(3*1+1)+(3*2+1)+(3*3+1)

Answer 5

oooohhh so its 21, that makes total sense, and I also see what I was doing wrong...

Answer 6

so would the answer to the second one then be 9 instead of 6?

Answer 7

yeah, because you iterate twice(the 2 on the top)
so its (3*1)+(3*2)

Answer 8

gotcha, thank you so much!