在n个运动员中选出任意r个人参加比赛,有很多种不同的选法,选法的个数可以用公式 计算。下
Private Sub Command1_Click()
Dim r As Integer, n As Integer
n = Text1
r = Text2
Text3 = fun(n) / fun(______) / fun(r)
End Sub
Function fun(n As Integer) as long
Dim t As Long
______
For k = 1 To n
t = t * k
Next
fun = t
End Function