MATHCOUNTS Mini #33 - More Constructive Counting

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This video focuses on constructive counting.
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Video by Art of Problem Solving's Richard Rusczyk, a MATHCOUNTS alum. Visit Art of Problem Solving for many more educational resources.
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...The MathCounts videos are among highlights of each month! Thank you, keep 'em coming!

jwm
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In the second problem, it does not say that a cannot equal b, so could the answer actually be 63?

toddbiesel