Homework Help: Geometry

Posted by John on Tuesday, March 12, 2013 at 10:06pm.

Let S = \{ 1, 2, 3, \ldots 12\} and T_1, T_2, \ldots T_a be subsets of S such that T_i \not \subset T_j \, \forall i \neq j . What is the maximum possible value of a?

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