Asked by Josh
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?
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?
Answers
Answered by
Damon
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
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
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