A puzzle

Discussion in 'General Discussion' started by David M, Apr 7, 2012.

  1. David M

    David M Techphile.

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    Solve for the last number...

    8809=6
    7111=0
    2172=0
    6666=4
    1111=0
    3213=0
    7662=2
    9313=1
    0000=4
    2222=0
    3333=0
    5555=0
    8193=3
    8096=5
    7777=0
    9999=4
    7756=1
    6855=3
    9881=5
    5531=0
    2581=?
     
    Last edited: Apr 7, 2012
  2. auen1

    auen1

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    Had a little help, but got it.:D
     
  3. HAL9000

    HAL9000

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  4. David M

    David M Techphile.

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    Correct HAL

    If you know why it is 2, then please don't say just yet. :)
     
    Last edited: Apr 8, 2012
  5. bob

    bob

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    Just remove the numbers that are equal to 0 and then look at what is left.
     
  6. David M

    David M Techphile.

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    That's not officially it bob, but maybe you found a pattern that I was not aware of. Explain it, I don't know what you mean. Do you mean the sum of the four digits that are equal to zero?
     
  7. bob

    bob

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    Remove 1 2 3 5 7 because
    1111=0
    2222=0
    3333=0
    5555=0
    7777=0

    Now you have
    8809=6
    7111=0
    2172=0
    6666=4
    3213=0
    7662=2
    9313=1
    0000=4
    8193=3
    8096=5
    9999=4
    7756=1
    6855=3
    9881=5
    5531=0

    Now remove them again
    6666=4
    66=2
    9=1
    0000=4
    89=3
    8096=5
    9999=4
    6=1
    68=3
    988=5

    See the solution?:)

    6,9,0 are 1's
    8's are 2's
     
  8. HAL9000

    HAL9000

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    I'm getting lost in your solution bob... probably cuz my final project is frying my brain... but the solution I have is MUCH simpler.
     
  9. bob

    bob

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    Your solution is the same. I did it by assuming the numbers were codes. I probably over thought the puzzle but when you do them you must first guess and then test or eliminate possibilities.
    I saw patterns and made assumptions. I actually got it quicker because the answer was already posted.
    Assume the numbers mean something - but what. Use the info to see which can simplify the problem and remove them - then look for the pattern.

    Edit.
    I see puzzles as functions with a domain and a range.
     
    Last edited: Apr 8, 2012
  10. HAL9000

    HAL9000

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    Oh wait... I think I see how you arrived at the same thing I did... After a minute of not seeing what I would naturally look for, I suddenly saw the answer.
     

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