881st position of different words alphabetically7 letters A, N, A, V, I, S, O
Source: Portugal OPM 2002 p1
May 19, 2024
combinatorics
Problem Statement
The keyword that Ana Viso chose for her computer has the characters of her name: A, N, A, V, I, S, O. Sorting all the different words alphabetically formed by all these characters, Ana's keyword appears in the st position. What it is Ana's keyword?