MathBox
1.
n
P
r
n =
r =
null
0
P
0
= 1
2.
n
C
r
n =
r =
null
0
C
0
= 1
3. Factorial
n =
null
0! = 1
4. Scheme
Expression =
(+ 1 (npr 5 2))
unexpected expression: undefined
(+ 1 (npr 5 2))
Result: undefined