A series is the sum of the terms of a sequence.
We can also write a series using Σ (sigma) notation — a compact way to express long sums.

Sequence2, 4, 6, 8, 10
Series2 + 4 + 6 + 8 + 10
Sigma formΣ (2n), n=1 to 5
Example 1 of 6
Question 1