If you have 100 pennies and you are suppose to make an array do you arrange the pennies by date?
If the only instructions were to make an array then I think you are expected to put them in a rectangular array. There are many ways to do this, and I expect that this is the reason you were asked to do it. You might have 2 rows of 50 pennies each or 25 rows of 4 pennies each or ...
How many different rectangular arrays can you make?Penny
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