Solutions due by high noon on Friday, Oct 31.
Friday the 13th Since this problem is due on Halloween, we’ll consider a horror theme about conjectures related to Friday the 13th. Prove or disprove each of the conjectures.
- If January 13th is on a Friday, that year will feature exactly three Friday the 13ths.
- If a year has exactly three Friday the 13ths, the first one will be in January.
- Every year has at least one Friday the 13th.
This problem is brought to you by Prof. Robin Lock.
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