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Coincidental Days (Posted on 2012-02-16) Difficulty: 3 of 5
A "coincidental day" corresponds to a date when both the date and its reversal, expressed in the mm-dd-yyyy format, shares the same day of the week.

For example, 09-22-2020 (in mm-dd-yyyy format) will occur on a Tuesday. Reversing the digits and expressing it in mm-dd-yyyy format, we obtain 02-02-2290 which will occur on a Sunday. Therefore, September 22, 2020 is NOT a coincidental day.

(i) Determine the total number of coincidental days between January 1, 2001 and December 31, 2099.

(ii) Determine the number of coincidental days that fall on a Sunday in the period covered under (i).

(iii) What is the last coincidental day in the period covered under (i)?

See The Solution Submitted by K Sengupta    
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  Subject Author Date
SolutionWith requirement of a 21st century reversal....Dej Mar2012-02-19 15:06:03
Solutioncomputer solutionCharlie2012-02-16 15:34:41
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