首先，我们需要计算组合数。组合数C(n, k)表示从n个元素中选择k个元素的方式数。

公式中的C(n, k)可以使用以下公式计算：

C(n, k) = n! / (k! * (n-k)!)

其中，n!表示n的阶乘，即n! = n (n-1) (n-2) ... 2 * 1。

现在，我们来计算公式的结果：

[C(5, 1) C(1000, 4) + C(5, 2) C(1000, 3) + C(5, 3) C(1000, 2) + C(5, 4) C(1000, 1)] / C(1005, 5)

= [5! / (1! (5-1)!) 1000! / (4! (1000-4)!) + 5! / (2! (5-2)!) 1000! / (3! (1000-3)!) + 5! / (3! (5-3)!) 1000! / (2! (1000-2)!) + 5! / (4! (5-4)!) 1000! / (1! (1000-1)!)] / (1005! / (5! * (1005-5)!))

= [5 1000! / (4! 996!) + 10 1000! / (3! 997!) + 10 1000! / (2! 998!) + 5 1000! / (1! 999!)] / (1005! / (5! * 1000!))

= [5 1000 999 998 997 + 10 1000 999 998 + 10 1000 999 + 5 1000] / (1005 1004 1003 1002 1001 / (5 4 3 2 1))

= (5 1000 999 998 997 + 10 1000 999 998 + 10 1000 999 + 5 1000) / (1005 1004 1003 1002 1001 / 120)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) / (1005 1004 1003 1002 1001 / 120)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 999 998 997 + 10 999 998 + 10 999 + 5) 120 / (1005 1004 1003 1002 * 1001)

= (5 *