The bivariate beta type I pdf is given by fX1​,X2​​(x1​,x2​)=x11−a​x21−b​(1−x1​−x2​)1−c120​,x1​>0,x2​>0,x1​+x2​<1 (a) Find the marginal pdf of X1​. (b) Evaluate the marginal pdf of X1​ in 4 (a) when a=1,b=2 and c=3.