NSW Y11 Maths - Extension 1 Permutations and Combinations Pascals Triangle

Resources for Pascals Triangle

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Pascals Triangle Theory

NSW Syllabus Reference

NSW Syllabus Reference: ME-A1.2: The binomial expansion and Pascal’s triangle. This will require student to 

  • expand \((𝑥 +𝑦)^𝑛\) for small positive integers \(𝑛\) (ACMMM046)
  • derive and use simple identities associated with Pascal’s triangle (ACMSM009)

Ref: https://educationstandards.nsw.edu.au/

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Videos

Videos relating to Pascals Triangle.

  • Pascals Triangle - Video - Binomial Theorem Expansion, Pascal's Triangle, Finding Terms & Coefficients, Combinations

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Theory

The rules for creating Pascal’s triangle:

  • The outer coefficients are unity
  • The inner coefficients come from the addition of the two adjacent numbers immediately above.
  • Each row has an extra number from the row above.

For example:

\[\begin{array}{*{20}{r}}{}&{}&{}&{}&1&{}&{}&{}&{}\\{}&{}&1&{}&2&{}&1&{}&{}\\{}&1&{}&3&{}&3&{}&1&{}\\1&{}&4&{}&6&{}&4&{}&1\end{array}\]

In the expanded form: \({\left( {1 + x} \right)^4} = 1 + 4x + 6{x^2} + 4{x^3} + {x^4}\)