(Text) Among the N lottery tickets numbered 1, 2, 3, ..., n, the lottery will not be put back. If 1 is the winning number, the lottery will be held at the k th time (1≤ k ≤

(Because this problem can be regarded as the n people whose numbers are 1, 2, 3, ..., each person touches a lottery, and the number k touches a lottery ticket. Everyone has the same probability of touching each number. So, the answer is. )