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Homework Statement
http://img234.imageshack.us/img234/8519/combgf7.png
[/URL]Homework Equations
[tex]{t}_k_+_1=_n{C}_kx^n^-^ky^k[/tex]
The Attempt at a Solution
The picture I have shown contains the problem and the teacher's solution. However, I was wondering how the [tex]k[/tex] value is 3. And no, I can't ask the teacher; my test is tomorrow.
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