Pascal's triangle

WordReference Random House Unabridged Dictionary of American English © 2025

Pascal's′ tri′angle, [Math.]

1. Mathematics a triangular arrangement of the binomial coefficients of the expansion (x + y)ⁿ for positive integral values ofn. 

• named after Pascal

Collins Concise English Dictionary © HarperCollins Publishers::

Pascal's triangle noun

1. a triangle consisting of rows of numbers; the apex is 1 and each row starts and ends with 1, other numbers being obtained by adding together the two numbers on either side in the row above: used to calculate probabilities

Etymology: 17th Century: named after Blaise Pascal