you can have duplicates.

so everyone can be 1 for example.

help me understand this sentence: "Each person receives an anonymous list of 99 numbers representing everyone else's numbers but not her own."

it reads to me, that a person would have a list of numbers that excludes the number they have.

Let's look at a smaller problem with 10 people and integers between 1 and 10 inclusive. Suppose the 10 numbers given out were 1, 2, 2, 2, 3, 6, 7, 8, 8, and 10.

Further suppose that Mary has been assigned the number 2 (not known to her, of course). Then Mary would be given the list 1, 2, 2, 3, 6, 7, 8, 8, and 10. One of the 2s would be

missing -- one that represents what she has been assigned. This is the intent of that sentence.