Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Find the sum of the first
20
20
20
terms of the arithmetic progression
3
,
8
,
13
,
…
3, 8, 13, \dots
3
,
8
,
13
,
…
.
Browse the problem library