posted by Luis .
Express the following in Sigma notation
Calculate the difference between successive terms of the sum. The differences are the terms you need to add together to make the sum.
1st term = 6
2nd term = 10
The rule is therefore 2+4i
So check if Σ2+4i works for you. i starts from zero.
My answer above applies if the list of numbers were successive sums.
Go with Reiny's answer: