\((2xy)2(3x^{2})(4y^{4})\\
(2*2*3*4)*(x*x^{2})*(y*y^{4})\\
48x^{3}y^{5}\\\\
3(2x)4(4x^{5}y)2\\
(3*2*4*4*2)*(x*x^{5})*y\\
192x^{6}y\\\\
(2n^{6}y^{5})(6n^{3}y^{2})(ny)3\\
(2*6*3)*(n^{6}*n^{3}*n)*(y^{5}*y^{2}*y)\\
36n^{10}y^{8}\\\\
(2a^{3}b^{2})(b^{3})2\\
(2*2)*a^{3}*(b^{2}*b^{3})\\
4a^{3}b^{5}\)
