There are 12 presents under the tree. Gollum is told he can
pick any 1 or any 2 or any 3 presents? How many different
possibilities exist for what Gollum can have under these
circumstances?

What properties does an
Equivalence Relation
have? Reflexive
Symmetric
Transitive
Antisymmetric

What properties does a POSET have? Reflexive
Symmetric
Transitive
Antisymmetric

How many partitions of a 4 element set are possible?

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