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Scanned with CamScanner, Marginal Distribution :-, Let XM (n, P),, Xx=Xx) =, E *: (0,,.n) st Zizn, o<Picl, s·t. Ž PiE!, The marginal p.m.f. of x, is given by,, J O.w., P(X,=x), M.... P(Xzx, ,X2:Xe, .. .. , Xx=x), P(X,4), Z P(), n!, P Pz, . Pie, ...., ... .., P(X), frody, multiplying and dividing by (n-x,)!, we get,, 2,! (n-x,)!, P2. Ps.... Pre, ..., x,! (n-z,)!, n-X,, .+ Pie), Using Multinomial thm, • D ...., n Car, ..., ŽPi =1.