Examples

1. Express the sum of first 100 terms of the sequence

{𝑎𝑛} where 𝑎𝑛 =1

𝑛for n=1, 2, 3, ….

2. What is the value of 𝑗=15 𝑗2

3. What is the value of 𝑘=48 −1 𝑘

Examples

𝑖=1

4

𝑗=1

3

𝑖𝑗 =

𝑖=1

4

𝑖(1 + 2 + 3)

Example

𝑘=50

100

𝑘2