Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Problem
Problem
If
4
C
r
−
6
=
3
C
r
+
1
{}^4C_{r-6} = {}^3C_{r+1}
4
C
r
−
6
=
3
C
r
+
1
, the value of
r
r
r
is a. 6 b. 8 c. 10 d. 12
Browse the problem library