Question 1137753

{{{(x + 3y)^6 =6C0*x^6*(3y)^0+6C1*x^5*(3y)^1+6C2*x^4*(3y)^2}}}..........

=>{{{6C2*x^4*(3y)^2=15x^4*9y^2=135x^4*y^2}}}


=> the coefficient of {{{x^4y^2}}} is {{{135}}}