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<math>(x+y)^2=x^2+2xy+y^2</math>

<math>(x+y)^3=x^3+3x^2y+3xy^2+y^4</math>

<math>(x+y)^4=x^4+4x^3y+6x^2y^2+4xy^3+y^4</math>

<math>(x+y)^5=x^5+5x^4y+10x^2y^3+10x^3y^2+5x^4y+y^5</math>

<math>and.so.on</math>…

Pascal's Pyramid:

         1

        1 1

       1 2 1

      1 3 3 1

     1 4 6 4 1

   1 5 10 10 5 1

  1 6 15 20 15 6 1

 a n d   s o   o n …