C(4,1)*C(13,2)*C(13,1)*C(13,1)*C(13,1)/C(52,5)
=4*13*12/(1*2)*13*13*13*(1*2*3*4*5)/(52*51*50*49*48)
=13*13*13*3/(51*10*49)
≈0.2637
C(4,1)*C(13,2)*C(13,1)*C(13,1)*C(13,1)/C(52,5)
=4*13*12/(1*2)*13*13*13*(1*2*3*4*5)/(52*51*50*49*48)
=13*13*13*3/(51*10*49)
≈0.2637