You do not need binomial coefficients or Pascal's triangle for the first one
The first and last exponents are ONE
ah now we are talking
14C13 = 14!/[13!(14-13)!]
= 14
14C12 = 14! / [ 12!(14-12)! ]
= 14 *13 / 2
= 7*13
= 91
What is the coefficient of y^14 in the expansion of (x+y)^14?
What is the coefficient of xy^13 in the expansion of (x+y)^14?
What is the coefficient of x^2y^12 in the expansion of (x+y)^14?
1 answer