Question 1082744

{{{(x + 4y)^4}}}

{{{(x + 4y)^2*(x + 4y)^2}}}

{{{(x^2 + 8xy +16y^2)*(x^2 + 8xy+ 16y^2)}}}

{{{x^4 + 16x^3*y + 96x^2*y^2 + 256xy^3 + 256y^4}}}

the fourth term in the expansion {{{256xy^3 }}}