Keywords: Combinations with repetition; 7 multichoose 1.svg This file shows the trivial bijection between the 1-element multisets with elements from <math>\ 1 2 3 4 5 6 7\ </math> right side and the 1-element subsets of a 7-element set left side Compare e g File Combinations with repetition; 5 multichoose 3 svg own Lipedia Combinations with repetition |