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October 25, 1881 was a
Tuesday
How to solve:
October 25, 1881
1
Century anchor
1800s
→
Friday (5)
Practice →
2
Divide by 12
81 ÷ 12
→
6
Practice →
3
Remainder of 12
81 % 12
→
9
Practice →
4
Divide remainder by 4
9 ÷ 4
→
2
Practice →
5
Year's doomsday
(5 + 6 + 9 + 2) % 7
→
1 → Monday
Practice →
6
Month doomsday
October
→
10th
Practice →
7
Distance
25 − 10
→
15
Practice →
8
Final answer
(1 + 15) % 7
→
2 → Tuesday
Practice the Doomsday algorithm →