Răspuns :
8 multimi.
X poate fi {1,2,3,4,5};{4,5};{1,4,5};{1,2,4,5};{1,3,4,5};{2,4,5};{2,3,4,5};{3,4,5}.
X poate fi {1,2,3,4,5};{4,5};{1,4,5};{1,2,4,5};{1,3,4,5};{2,4,5};{2,3,4,5};{3,4,5}.