We 

We  now can see how nice it is to use Pascal’s triangle when expanding binomial expressions. Each row of the triangle matches the  coefficients of a binomial expansion of the form (x+y)^n \(\left(x+y\right)^n\)  where n is \(n\) is  the number of the row. We start counting at the top of Pascal's triangle where the first  number (number 1) \(1\))  Is the row zero and the row containing two ones, is row 1.