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November 11, 1918 was a
Monday
How to solve:
November 11, 1918
1
Century anchor
1900s
→
Wednesday (3)
Practice →
2
Divide by 12
18 ÷ 12
→
1
Practice →
3
Remainder of 12
18 % 12
→
6
Practice →
4
Divide remainder by 4
6 ÷ 4
→
1
Practice →
5
Year's doomsday
(3 + 1 + 6 + 1) % 7
→
4 → Thursday
Practice →
6
Month doomsday
November
→
7th
Practice →
7
Distance
11 − 7
→
4
Practice →
8
Final answer
(4 + 4) % 7
→
1 → Monday
Practice the Doomsday algorithm →