Pascal's identity(redirected from Pascal's rule)
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Pascal's identity[pa¦skalz ī′den·ə·dē]
The equation where, in general, C (n, r) is the number of distinct subsets of r elements in a set of n elements (the binomial coefficient).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.