Randomly select a year, what is the probability that January 1 of that year is a Sunday? Is it 1/7? This question is made more complicated by the presence of leap years with 29 days in February. Recall that a year is a leap year if the year number is divisible by 4 but not 100, unless it is also divisible by 400.
[Last updated on September 27, 2000.]
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