Question 618376
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Hi,
RE Pascal Triangle: {{{(x+Y)^4 = x^4+ 4x^3Y +6x^2Y^2 + 4XY^3 + Y^4}}}
{{{(2x-9y)^4 = (2x)^4 + 4(2x)^3(-9y) + 6(2x)^2(-9y)^2 + 4(2x)(-9y)^3 + (-9y)^4}}}
 {{{16x^4+-288x^3y+1944x^2y^2+-5832xy^3+6561y^4}}}