Pascal's triangle
noun
Pas·cal's triangle
| \ pa-ˈskalz-
, pä-ˈskälz-\
, pä-ˈskälz-\
Definition of Pascal's triangle
: a system of numbers arranged in rows resembling a triangle with each row consisting of the coefficients in the expansion of (a + b)n for n = 0, 1, 2, 3, …
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