Question Detail
Question
What is the sum of the coefficients in the binomial expansion of (x-y)^n?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The sum of coefficients in the expansion of (x-y)^n can be found by setting x=1 and y=1: (1-1)^n = 0^n = 0. Therefore, the sum of all coefficients is 0.
Hint
Substitute x=1 and y=1 to find the sum of coefficients.