the thing I learned in this week is Arithmetic sequences／series and Geometric sequences/ series.
Key notes
- the difference between sequences and series
sequences:5,9,13,17…
series:5+9+13+17…
- importent formula
Arithmetic sequences
Arithmetic series
geometric sequences
geometric series
Example
- how to solve the Arithmetic series?
ex: Find the sum of the following arithmetic series 1,2,3…..99,100
We have a total of 100 values, so n=100. first value is 1 and the last is 100. We plug these values into our formula, get:
- how to solve the geometric series?
