In a Gregorian calendar, a year finishing with
00 is a leap year if only it′s vintage is divisible
by 400. Also, the 1^(st) January 1900 was a
Monday.
1\ Show that a year with the vintage finishing with
00 cannot begin on a Sunday
2\ Show that for a person born between 1900−2071,
his 28 anniversary will occur on the same
day of birth.
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