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Friday the 13th
When's the next year when there won't be a Friday the 13th?
Answer:
Never. If we count backwards from Friday the 13th, we can find that Friday the 13ths only and always appear on months that have Sunday as the first. We can also assume, that out of 12 months, there is a 1.7 (12 months/7 days of the week) chance of there being a Sunday as the first day of the month. Since this number is over 100%, we can promise that there will never be a year without at least one Friday the 13th. Now isn't that unlucky!
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