Page "Pascal's pyramid" Paragraph 30
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It also makes the connection with the Tetrahedron obvious − the coefficients here match those of Layer 4.
All the implicit coefficients, variables, and exponents, which are normally not written, are also shown to illustrate another relationship with the Tetrahedron.
( Usually, " 1A " is " A "; " B < sup > 1 </ sup >" is " B "; and " C < sup > 0 </ sup >" is " 1 "; etc.
More significantly, the value of the coefficients of each term can be computed directly from the exponents.
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