The features of Pascal’s Triangle are generalised to 3-variable and 4-variable expressions resulting in the formation of pyramids of coefficients. The steps required to create the coefficients are also given.
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Baker, John E.
Pascal Pyramids: a mathematical exploration using spreadsheets,
Spreadsheets in Education (eJSiE):
2, Article 3.
Available at: http://epublications.bond.edu.au/ejsie/vol6/iss2/3