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You can also sum the little squares by adding 1+3+5+7+9+11+13 ((yellow)+(blue)+(green)+(orange)+(red)+(dark blue)+(burgundy)). Since visually this forms a square the sum is also 7^2. Generally this is true.The sum of the first n odd numbers is n^2.\
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Read more here\’a0https://en.wikipedia.org/wiki/Square_number\
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