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richard leyton
Traduzir   13 anos atrás

Balls You have nine balls, and a set of balance scales. All nine balls are identical in appearance. One ball is a different weight (it could be heavier or lighter). What is the minimum number of measurements you need to take to be certain which ball is different?

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Adam Neilson
4
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· 0 · 1336776439
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Adam Neilson
Actually no, 2. Divide into three groups of three. Measure two groups against each other. If they balance then it's the one you didn't measure. Then measure two balls from the heaviest group. So 2 measurements.
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· 0 · 1336776826
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Lucius Lannister
@Seamonster agreed
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· 0 · 1336776886
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Lucius Lannister
@Weirdwolf *hopeing nobody realises he's bluffing*
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· 0 · 1336776920
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Kivi He
@Seamonster perfect answer!! I discussed with my friend lol
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· 0 · 1336776998
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Lee
@Seamonster @Weirdwolf @kivihe I reckon the answer's 2...
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· 0 · 1336777870
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Lucius Lannister
@leelee101 *hasn't noticed Weirdwolf is bluffing*
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· 0 · 1336778334
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Lucius Lannister
@kivihe *neither has kivihe*
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Lee
@Weirdwolf clearly doesn't realise that you can't kid a kidder...
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· 0 · 1336778535
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Kivi He
@Weirdwolf 😷😷 as @Seamonster said, divided into 3 groups. Measure first group and second. If balanced, then randomly choose 2 balls from the third group. If matched, last one is the diff one. If didn't, wight again. 3 times at least? But it maybe wrong...
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· 0 · 1336779063
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Cataract / Stevo Owens
It's 3
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Lucius Lannister
@kivihe I'm going to play devils advocate and say 3. Why not? I have no Idea if it's 2 or 4!
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· 0 · 1336779216
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Cataract / Stevo Owens
That was a treat. More please.
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Lee
@Weirdwolf @kivihe I say it's 1. Or 2. Or 3. Ok, 4. 5 at a push. I'm kinda winging it...
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· 0 · 1336779371
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Lucius Lannister
@Weirdwolf 9 divided by 3 is 3, halved is 1.5. No .5's in equal measurements, the answer is 3
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· 0 · 1336779373
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Kivi He
@Weirdwolf lol😜
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Lucius Lannister
@leelee101 he never said you could divide the balls
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Lee
@kivihe @Weirdwolf it's 3. Don't you two know anything... Heh 😉
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· 0 · 1336779511
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Kivi He
@leelee101 haha I'd u keep thinking this, u will be awake lol xx
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· 0 · 1336779803
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Lee
@Weirdwolf @kivihe I knew it was 3 all along... Ball dividing, pah I've had enough now!
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· 0 · 1336779974
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Lucius Lannister
@leelee101 took me a while
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· 0 · 1336780194
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Lee
@Weirdwolf I was just assing around I'm afraid.. Good late night banter tho! 😉
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Lucius Lannister
@leelee101 you watch, just to make us all loom silly it will be 5
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· 0 · 1336780772
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Lucius Lannister
@Weirdwolf *looked
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Lee
@Weirdwolf and thank you for the sneaky late night repost too... 😉
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Lucius Lannister
@Weirdwolf not *looked, *look. Bloody thumbs need to catch up with finger evolution!
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· 0 · 1336780846
 
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