. Which day of the week was 20-12-2012?
a) Monday
b) Tuesday
c) Thursday
d) Sunday

• formula:
  (Given date+Month code+Year code+Number of completed years+Number of leap years) / 7
  
  Month code:
  -------------------
  1-->Jan 4-->feb 4-->march |0 --->Apr 2-->may 5-->june|0-->july 3-->aug 6-->sep |1-->oct 4-->nov 6-->dec
  remember month codes like for 1st 3months--> (12^2=144), 2nd 3 months-->(05^2=025), 3rd 3months-->(o6^2=036), 4th 3 months-->(12^2+2=146)
  
  code for year:
  ------------------
  1601 to 1700--------->6
  1701 to 1800--------->4
  1801 to 1900--------->2
  1901 to 2000--------->0
  2001 to 2100--------->6
  
  No of completed years:
  ---------------------------------
  how many years completed in that centuary(ex: for 2012, 12 years are completed(from 2000 to 2012).
  
  No of leap years:
  -----------------------
  
  last two digits of the given year divided by 4 and we can take quotient as a no of leap years(ex: fro 2012, 12/4=3 is the quotient).
  
  Ans:20+6+6+12+3 / 7= 47 / 7
  we get remainder 4(thursday)
  
  0-sunday
  1-monday
  2-tuesday
  3-wednesday
  4-thursday
  5-friday
  6-saturday
• 9 years agoHelpfull: Yes(4) No(2)
• Ans: Thursday.
  20-12-2014 was saturday
  20-12-2013 was friday
  20-12-2012 was thursday
• 9 years agoHelpfull: Yes(3) No(1)
• 2000+11 years+11month+ 20 day implies that.........upto 2000 -0 odd day....11 year=2 leap years + 9 normal= 2*2 +9*1 odd days + 3+ 1+3+2+3+2+3+3+2+3+2+20 days == total 60 odd days== 8 week 4 odd day;; 4 odd days implies thursday... i.e 0 - sunday
• 9 years agoHelpfull: Yes(1) No(0)
• ans is c: thursday
• 9 years agoHelpfull: Yes(0) No(0)