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idku

  • one year ago

little challenge. You have 8 balls (all look and) weight the same BUT 1 of the balls weights less than the rest. You have a scale, and you can use the scale twice. How can you determine which ball is the ball that weighs less ?

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  1. idku
    • one year ago
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    oh, message. please don't just give it away...

  2. sdfgsdfgs
    • one year ago
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    "You have 8 balls (all look and) weight the same BUT 1 of the balls weights less than the rest." I think it should say... "You have 8 balls (all look and) weight the same PLUS 1 balls which weighs less than the rest." :)

  3. idku
    • one year ago
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    but is a corresponding conjunction that fits the purpose that I want to indicate. That is, that although 8 balls weight the same, there is an exception (one of the balls weighs less).

  4. welshfella
    • one year ago
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    yes but that is 3 weighings

  5. sdfgsdfgs
    • one year ago
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    @idku its ur Q so u get to decide how it reads :P i just thought making 9 the total no. of balls will make the Q easier! lol

  6. welshfella
    • one year ago
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    if you take 2 pairs of 3 and they weigh the same then the light ball is one of the other 2 You then weigh one against the other to find the light ball.

  7. welshfella
    • one year ago
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    oh we have nine balls?

  8. welshfella
    • one year ago
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    oh we decide 8 or 9 right?

  9. sdfgsdfgs
    • one year ago
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    @welshfella Nope - I thought it was with 9 balls but OP said its 8. either way u got it :)

  10. geerky42
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @sdfgsdfgs "You have 8 balls (all look and) weight the same BUT 1 of the balls weights less than the rest." I think it should say... "You have 8 balls (all look and) weight the same PLUS 1 balls which weighs less than the rest." :) \(\color{blue}{\text{End of Quote}}\) I'm sure OP is intended to say first one...

  11. imqwerty
    • one year ago
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    the question is what is the final question??

  12. welshfella
    • one year ago
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    now if one set of 3 balls weigh differently you take the lightest and pick 2 out and weigh them again If 0ne wieghs light its that one If they weigh the same its the other ball.

  13. sdfgsdfgs
    • one year ago
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    correct @welshfella n thats why I thought making a total 9 would be easier. But same method will work for 8.

  14. welshfella
    • one year ago
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    good question

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