|
| n! | n! | |||||||||||||||||
L = | + | = | + | = | ||||||||||||||||
| k!*(n−k)! | (k+1)!*(n−k−1)! |
| n!*(k+1) | n! | |||
= | + | = | ||
| (k+1)!*(n−k−1)!((n−k) | (k+1)!*(n−k−1)! |
| n! | k+1 | n! | ||||
= | ( | + | = | |||
| (k+1)!*(n−k−1)! | n−k | (k+1)!*(n−k−1)! |
| n! | k+1 | |||
= | [ | + 1] = | ||
| (k+1)!*(n−k−1)! | n−k |
| n! | k+1 + n − k | |||
= | * | = | ||
| (k+1)!*(n−k−1)! | n−k |
| n! | n+1 | |||
= | * | = | ||
| (k+1)!*(n−k−1)! | n−k |
| n!*(n+1) | ||
= | = | |
| (k+1)!*(n−k−1)!*(n−k) |
| (n+1)! |
| |||||||||
= | = | = P | ||||||||
| (k+1)!*(n−k)! |