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Mathigon
Mathigon: Algebra: Sequences: Pascal's Triangle
This lesson focuses on Pascal's Triangle, a number pyramid in which every cell is the sum of the two cells directly above. It contains all binomial coefficients, as well as many other number sequences and patterns.
Math Planet
Math Planet: Algebra 2: Binomial Theorem
Provides an explanation, examples, and a video lesson all related to the binomial theorem. [1:30]