Pascal´s triangle
A triangular array of numbers in which each row starts and ends with 1 and each number in between is the sum of the pair of numbers above it. The number at the apex is 1.

The numbers at the nth row of Pascal´s triangle are the same as the coefficients of x and y in the expansion of

symbol space(x + y)n-1

in which n > 1.

Related Term: binomial theorem

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