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Algebra Difficulty 3.9 AMC 10/12 Find the answer United States
Problem:
What is the sum of the coefficients of the expansion (x+2y−1)6?
A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.
Solution
Solution:
The sum of the coefficients of a polynomial is that polynomial evaluated at 1, which for the question at hand is (1+2⋅1−1)6=26=64.
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