Sequences and summations

11. Examples
1. Express the sum of first 100 terms of the sequence
{𝑎 𝑛} where 𝑎 𝑛 =
1
𝑛
for n=1, 2, 3, ….
2. What is the value of 𝑗=1
5
𝑗2
3. What is the value of 𝑘=4
8
−1 𝑘

13. Examples
𝑖=1
4
𝑗=1
3
𝑖𝑗 =
𝑖=1
4
𝑖(1 + 2 + 3)

14. Example
𝑘=50
100
𝑘2