Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Find the sum of first 20 terms of an A.P. whose
n
n
n
th term is given as
a
n
=
5
−
2
n
a_n = 5 - 2n
a
n
=
5
−
2
n
.
Browse the problem library