概车纶与款理统外「 现在求条件分布律. PX=mY=nj,P(Y=nX=m), 由于Px=m}=∑PX=m,Y=m=∑p2q2 1=m =m+1 =p2g-Pg=pg =m+1 1-q PY=my=2PX=m,Y=网 m=1,2,.y 2r=m-pg,n=23, = =1 现在求条件分布律． 由于   = + = = = = 1 { } { , } n m P X m P X m Y n   = + − = 1 2 2 n m n p q   = + − = 1 2 2 n m n p q q p q m − = − 1 2 1 , −1 = m pq m = 1,2,  ,  − = = = = = 1 1 { } { , } n m P Y n P X m Y n  − = − = 1 1 2 2 n m n p q ( 1) , 2 −2 = − n n p q n = 2,3,  . P{X = mY = n}, P{Y = n X = m}