Question 781563
Use Pascal's triangle and the following formula to expand binomials (x+y)^n.<P>
nC0 * x^n * y^0 + nC1 * x^(n-1) * y^1 +...nCn * x^(n-n) * y^n where n is the row (starting from 0) of Pascal's triangle, the number after C is the item position in that row, starting from 0.<P>
For the third term of (x+y)^9 it's 9C2 x^(n-2) + y^2<P>
The number in Pascal's triangle that is the 9th row (counting the first row as 0), number in position 2, starting from 0, is 36.<P>
{{{36x^7y^2}}}