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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.
When people talk about an entry in Pascal's Triangle, they usually give a row number and a place in that row, beginning with row 0 and place 0. For instance, the number 20 appears in row 6, place 3.Pascal first published his ideas on the generation of the triangle in 1665.hen people talk about an entry in Pascal's Triangle, they usually give a row number and a place in that row, beginning with row 0 and place 0. For instance, the number 20 appears in row 6, place 3.