N is the number of ordered pairs of nonempty sets P and Q that have the following properties:
 P ⋃ Q ={1,2,3,4,5,6,7,8,9,10,11,12}, and:
 P ⋂ Q = Φ, and:
 The number of elements of P is not an element of P, and:
 The number of elements of Q is not an element of Q
Find N.
(In reply to
Answer only by Ady TZIDON)
I think you forgot the case when both sets have 6 elements, then there is no where to place 6 as this would violate either rule 3 or 4.

Posted by Daniel
on 20150413 13:47:57 