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1 year = 365 days = 52 weeks 1 day.
(1) If year 1 or year 2 of the 15 year period was a leap year then there would be 4 leap years in the period.
(2) If year 3 or year 4 was a leap year then there would be only 3 leap years in the period.
Each leap year gives 1 extra day.
Condition (1) 15 years = 15 x 52 weeks + 15 days + 4 days = 782 weeks + 5 days.
Condition (2) 15 years = 782 weeks + 4 days.
NOTE : Deduct 1 further day if the 15 year period spans a year number not divisible by 400 (for example 1900)
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