Question

Find the number of ways to distribute 11 non-identical items into 3 non-empty groups. (No ordering...

Find the number of ways to distribute 11 non-identical items into 3 non-empty groups.

(No ordering of people inside every group, and no ordering among the 3 groups.)

(Hint: The number of equivalent relations of a set of size 11 with exactly 3 equivalence classes.)

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