Why do we use letters like x and y to represent numbers in algebra?
In: Mathematics
When you’re representing an unknown number, you have to use a symbol other than a number. Letters work well, because we already recognize them and can tell them apart, so it’s easy to follow them through the equations. Also, the familiarity allows you to use a letter that’s related to what it represents, such as a for acceleration.
Classic sudoku is similar. You could use any nine symbols and it would work the same, but it’s much easier to see which one is missing from the row when it’s nine digits you’re familiar with
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