Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Problem
Problem
Find the number of non-negative integral solutions of
x
1
+
x
2
+
x
3
+
4
x
4
=
20
x_1 + x_2 + x_3 + 4x_4 = 20
x
1
+
x
2
+
x
3
+
4
x
4
=
20
.
Browse the problem library