week 2

the thing I learned in this week is Arithmetic sequences/series and Geometric sequences/ series.

Key notes

  • the difference between sequences and series



  • importent formula

Arithmetic sequences



Arithmetic series

geometric sequences

geometric series


  • 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?





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