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How to Construct Pascal's Triangle. In Pascal's Triangle, the top row is 1, with the second row just below it containing 1 and 1. To construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left.Put a 1 on both ends of each row.o construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left. Put a 1 on both ends of each row.
The coefficients are naturally analogous to the binomial coefficients, and can be arranged in a triangle like Pascalâs. These coefficients are known as Eulerian numbers, and the construction above is known as Eulerâs Number Triangle (not to be confused with the geometric construction called the Euler Triangle).