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79: 1 2 3 (Counting)
Breaking Math Podcast
How Many Handshakes Would That Be?
From top down, left to right, it's a sequence of numbers. So there's two, seven, six, nine, five, one, and then four, three, eight on the last row. That's a magic square where no matter which way you added up, down, left, right,. it's equal to the same number. And combinatorics was designed to study the properties of these objects.
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