Changes

*Then from the 2nd row each number in the triangle is the sum of the two directly above it.

*Then from the 2nd row each number in the triangle is the sum of the two directly above it.

*The construction is related to the binomial coefficients by Pascal's rule is :                                 

*The construction is related to the binomial coefficients by Pascal's rule is :                                 

<math>(x+y)^n=\sum_{k=0}^n \binom{n}{k}x^{n-k} .y^k </math>.    where <math> \binom{n}{k}</math> is the binomial coefficient.

<math>(x+y)^n=\sum_{k=0}^n \binom{n}{k}x^{n-k} .y^k </math>.    where <math> \dbinom{n}{k}</math> is the binomial coefficient.

*This function will return the result as error when the r <math> \le 0</math>.

*This function will return the result as error when the r <math> \le 0</math>.

==Examples==

==Examples==

#PASCALTRIANGLE(1)=1

*1.PASCALTRIANGLE(1)=1

#PASCALTRIANGLE(2)=1   

*2.PASCALTRIANGLE(2)=1   

                   1      1

                   1      1

#PASCALTRIANGLE(3)=1     

*3.PASCALTRIANGLE(3)=1     

                   1      1

                   1      1

                   1      2        1

                   1      2        1

   

   

#PASCALTRIANGLE(0)=NULL

*4.PASCALTRIANGLE(0)=NULL