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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.
1 Each line of the Pascal's triangle, has a direct effect on being shown using a base number to the power of the row number, with a few exceptions. 2  Some rows where the next box contains one or more numbers for the box, the tens place gets added to the box to the left of it.ascal's Triangle is an arrangement of multiple numbers that have been found to relate to many areas of math and science. This article will explain how you can form it.