1.C(52,13)C(39,13)C(26,13)C(13,13)=52!/(13!)^4 2.C(52,13)C(39,13)C(26,13)C(13,13)/A(4,4)=52!/24*(13!)^4 3.C(52,17)C(35,17)C(18,17)C(1,1)/A(3,3)=52!/6*(17!)^3
