Olympiad Math (December 7 – December 14, 2013)
Day of the Week
Today is Saturday, December 07, 2013. What day of the week 
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Correct answer were submitted by:
1. John Rey Jimenez. Negros Occidental High Schol
2. Arsh Singh. yourmathguru.com
3. Jomari Tan. DLSU
4. John Michael Maninang.UST
5. Raymond John Diaz. (School Please)
6. Jeffry Robles. University of the Philippines – Diliman
7. Roger Tseng
8. Marlon Chris Malicsi. UST
9. Muthu Krishnan .Kle College. Bengaluru
10. Kim Arvin P. Leocadio. Bicol University
11. Ana Quiros. DLSU.
12. Sidhhart Dwevide. IIT Bombay.
13. Quant Master. unknown. (comment your name and school pls)
14. Carl Joshua Quines, Valenzuela City Science HS
15. Carlo Jay Vizcarra. Pamantasan ng Lungsod ng Maynila
16. John Ryan Regalario (comment your school)
17. Mark C. Angeles from Unversity of Southeastern Philippines (USeP) Tagum City Campus
Dan
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John Michael Maninang
UST
Friday
Friday
Friday.Because 13 is equal to -1 modulo 7, so 13^2013 is equal to(-1)^2013=-1. One day before Saturday would be Friday.
friday
FRIDAY
Answer: Friday.
Friday
13 = -1 (mod 7)
So, 13^2013 = -1 (mod 7) = 6 (mod 7)
So, it was Saturday after (13^2013 – 6) days from now.
Hence after 13^2013 days, it will be Friday.
FRIDAY
Friday. Carl Joshua Quines, Valenzuela City Science HS
Friday
Pamantasan ng Lungsod ng Maynila
Friday
friday
Saturday
I’m Mark C. Angeles from Unversity of Southeastern Philippines (USeP) Tagum City Campus
My answer is Friday.
The correct answer is Friday. The simplest approach is Siddharth Dwivedi’s solution.
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