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Thread: A number puzzle that might send you insane

  1. #1
    Join Date
    Dec 2005
    Posts
    1,358

    Smile A number puzzle that might send you insane

    Good afternoon.

    Here's a nice, simple-looking number puzzle I came across recently.


    Make 24 using the numbers 1, 4, 5 and 6.

    Each number must be used exactly once.

    The allowed operations are add, subtract, multiply and divide.

    You cannot use powers.

    You cannot concatenate numbers (i.e. you can't use 4 and 5 to make 45).

    You can use brackets.


    There are two solutions, but they are maddeningly difficult to find.

    Good luck,

    clop

  2. #2
    Join Date
    Jul 2005
    Posts
    1,005
    If there is any kind of "spoiler" feature on this board, I can't find it - is there one?

  3. #3
    Join Date
    Jul 2005
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    1,005
    OK, I posted the answer here, at another forum, because I know how to use the spoiler feature there. If there is one here, I don't know how to use it. . .

  4. #4
    Join Date
    Dec 2005
    Posts
    1,358
    Wow wicked, did you work them both out yourself?

    clop

  5. #5
    Join Date
    Jul 2005
    Posts
    1,005
    Quote Originally Posted by clop
    Wow wicked, did you work them both out yourself?

    clop
    Yes, although the approach was a lot closer to brute force than I would like to admit

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