Must there be at least one Friday the 13th in every year? Use division to answer this question. (You may answer only for years that aren't leap years.) To get started on solving this problem, answer the following: If January 13th falls on a Monday, then what day of the week will February 13th, March 13th, and so forth, fall on? Use division with remainder to answer these questions. Now consider what will happen if January 13th falls on a Tuesday, a Wednesday, and so on.
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