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 March 31st, 2017, 04:34 AM #1 Newbie   Joined: Mar 2017 From: Greece Posts: 1 Thanks: 0 Need help with this sequence 123456789, 21230569, 26054, 1204, x I need to find what's next (x) Any help appreciated. Last edited by skipjack; March 31st, 2017 at 07:03 PM.
 March 31st, 2017, 05:40 PM #2 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 11,391 Thanks: 731 Are you serious?!
 March 31st, 2017, 06:28 PM #3 Newbie   Joined: Mar 2017 From: Minnesota, USA Posts: 6 Thanks: 0 Math Focus: All Last edited by skipjack; March 31st, 2017 at 07:02 PM.
April 2nd, 2017, 05:20 PM   #4
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Quote:
 Originally Posted by Denis Are you serious?!
Why isn't it serious?

 April 19th, 2017, 04:10 AM #5 Newbie   Joined: Apr 2017 From: durban Posts: 10 Thanks: 0 Math Focus: Algebra X = T5 T1 = 123456789 D = T2 - T1 D =-102226220 T5 = a +4d = 123456789 + 4(-102226220) 123456789 - 408904880 X = 285448091
 April 19th, 2017, 02:20 PM #6 Global Moderator   Joined: Dec 2006 Posts: 18,443 Thanks: 1462 That makes no sense. There must be something other than just addition or subtraction behind this puzzle. It must be more like solving a crossword clue, but based on numbers rather than letters.

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