Balls You have nine balls, and a set of balance ..

Vertalen 13 jaren geleden

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?

Respect!

Kommentar

· 0 · 1336776439

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.

· 0 · 1336776826

@Seamonster agreed

· 0 · 1336776886

@Weirdwolf *hopeing nobody realises he's bluffing*

· 0 · 1336776920

@Seamonster perfect answer!! I discussed with my friend lol

· 0 · 1336776998

@Seamonster @Weirdwolf @kivihe I reckon the answer's 2...

· 0 · 1336777870

@leelee101 *hasn't noticed Weirdwolf is bluffing*

· 0 · 1336778334

@kivihe *neither has kivihe*

· 0 · 1336778389

@Weirdwolf clearly doesn't realise that you can't kid a kidder...

· 0 · 1336778535

@Weirdwolf ð·ð· 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...

· 0 · 1336779063

It's 3

· 0 · 1336779195

@kivihe I'm going to play devils advocate and say 3. Why not? I have no Idea if it's 2 or 4!

· 0 · 1336779216

That was a treat. More please.

· 0 · 1336779235

@Weirdwolf @kivihe I say it's 1. Or 2. Or 3. Ok, 4. 5 at a push. I'm kinda winging it...

· 0 · 1336779371

@Weirdwolf 9 divided by 3 is 3, halved is 1.5. No .5's in equal measurements, the answer is 3

· 0 · 1336779373

@Weirdwolf lolð

· 0 · 1336779418

@leelee101 he never said you could divide the balls

· 0 · 1336779464

@kivihe @Weirdwolf it's 3. Don't you two know anything... Heh ð

· 0 · 1336779511

@leelee101 haha I'd u keep thinking this, u will be awake lol xx

· 0 · 1336779803

@Weirdwolf @kivihe I knew it was 3 all along... Ball dividing, pah I've had enough now!

· 0 · 1336779974

@leelee101 took me a while

· 0 · 1336780194

@Weirdwolf I was just assing around I'm afraid.. Good late night banter tho! ð

· 0 · 1336780351

@leelee101 you watch, just to make us all loom silly it will be 5

· 0 · 1336780772

@Weirdwolf *looked

· 0 · 1336780788

@Weirdwolf and thank you for the sneaky late night repost too... ð

· 0 · 1336780811

@Weirdwolf not *looked, *look. Bloody thumbs need to catch up with finger evolution!

· 0 · 1336780846

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