1
Q
Grouped situation (perms)
A
(# of groups)! (# of objects in each group)!
2
Q
Binomial Expansion formula
A
nCr = (a)n-r (b)r
3
Q
(n+1)! = ?
A
(n+1)(n)(n-1)(n-2)….
4
Q
Like Objects (letters)
A
n!
a! b! c!
5
Q
A
6
Q
Permutation Blocks
A
(# of Blocks Up + # of Blocks Right)!
(# of Blocks Up)!(# of Blocks Right)!
7
Q
Circular Perms
A
(n - 1)!
8
Q
0! = ?
A
1
9
Q
A
10
Q
n! = ?
A
(n)(n-1)(n-2)….
