Discussion
The calendar for the year 2007 will be the same as that for which year ?
Answer: C
Correct answer: 2018
A calendar repeats when the odd days since the starting year sum to a multiple of 7. Counting from 2007 onward, ordinary years contribute 1 each and the leap years 2008, 2012 and 2016 contribute 2 each.
\[1+2+1+1+1+2+1+1+1+2+1 = 14\]
Fourteen is a multiple of 7, and that total is reached at the end of 2017, so 2018 repeats the calendar of 2007.
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