Sum of First N Multiples of M #2
Review the Lesson | MATHguide homepage Updated June 30th, 2019


Status: Waiting for your answers.


Problem:Find the sum of these multiples of 7.

Plan:
  1. Find the number of terms in the series, n.
  2. Use the sum formula to calculate the sum of the series, Sn.
7 + 14 + 21 + ··· + 644

Step 1:n =

Step 2:Sn =