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Inverting Triangles (Posted on 2005-08-15) Difficulty: 1 of 5
A piece of paper had the following diagram:
               o              o o o o
      From:   o o         To:  o o o
             o o o              o o
            o o o o              o
Below it, it read "Given the initial formation of ten coins, move exactly # coins to produce the end formation." It was pretty obvious that # stood for a digit, but it was smudged and couldn't be read. What possible numbers could it have been so the problem was solvable?

To allow explaining the solution, number the coins like this:

           0 
          1 2
         3 4 5
        6 7 8 9
Note: This problem was inspired by a forum question by Nicole.

No Solution Yet Submitted by Erik O.    
Rating: 2.1667 (6 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solution8th solutionMindy Rodriguez2005-11-22 23:33:54
solutionronwilliams2005-11-09 10:46:31
re(3): 7 waysWill2005-08-24 21:34:23
re(2): 7 waysLisa2005-08-16 09:49:31
re(2): 7 waysbrianjn2005-08-16 02:53:44
re: 7 waysNosher2005-08-16 02:37:50
re(3): 7 ways - your rulesbrianjn2005-08-16 01:42:35
re(2): 7 ways - your rulesowl2005-08-15 15:23:34
re: 7 ways - your rulesbrianjn2005-08-15 13:23:41
Solution7 waysLisa2005-08-15 09:04:48
Solutionre: # = 3 solutions Plus Threebrianjn2005-08-15 05:47:15
Some ThoughtsPartial solutions and observationsowl2005-08-15 04:36:29
Solution# = 3 solutionsbrianjn2005-08-15 02:53:56
SolutionSolutionBractals2005-08-15 02:46:19
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