MATHCOUNTS Mini #42 - More Constructive Counting

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This video focuses on constructive counting.

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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for 1st problem, you could do complementary counting.

keshavb
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Can someone please explain the diagram that he used on the first question? Thanks

alimarfathia
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Ok, it's pronounced MAKA - ALA not MAKALA and it is my middle name

jaxsonpahukula