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July 24th, 2012, 09:24 AM  #1 
Senior Member Joined: Apr 2012 Posts: 799 Thanks: 1  try your calculation
[attachment=0:zwzp9khz]2001.jpg[/attachment:zwzp9khz] Ans:2001 
July 24th, 2012, 09:32 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,702 Thanks: 1527 
199919991999/100010001 + (2/1) = 1999 + 2 = 2001

July 24th, 2012, 10:02 AM  #3 
Senior Member Joined: Apr 2012 Posts: 799 Thanks: 1  Re: try your calculation
skipjack :very good

July 24th, 2012, 02:31 PM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,764 Thanks: 1012 Math Focus: Elementary mathematics and beyond  Re: try your calculation
2000 × 1999  2001 × 1998 = 2000 × 1999  (2000 × 1998 + 199 = 2000 × 1999  2000 × 1998  1998 = 2000(1999  199  1998 = 2.

July 24th, 2012, 04:38 PM  #5 
Global Moderator Joined: Dec 2006 Posts: 18,702 Thanks: 1527 
For any value of n (including 199, (n + 2)(n + 1)  (n + 3)n = 2.

July 24th, 2012, 05:37 PM  #6 
Senior Member Joined: Apr 2012 Posts: 799 Thanks: 1  Re: try your calculation
[attachment=0:iantrghf]2001~.JPG[/attachment:iantrghf]


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