Differences

This shows you the differences between two versions of the page.

--- courses:be5b33prg:homeworks:balls [2016/11/09 15:33]
xposik [The puzzle]
+++ courses:be5b33prg:homeworks:balls [2016/11/09 15:36]
xposik [The puzzle]
@@ Line 14: / Line 14: @@
 {{ https://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/200_-_gram_balance_scales.jpg/330px-200_-_gram_balance_scales.jpg}}
-//We have 12 balls, all are exactly the same in all respects, with a single exception. One of the balls is either slightly lighter of slightly heavier that the other 11. (And we do not know whether it is lighter or heavier). "Slightly" means that the difference is very small and you need to use an accurate weighing instrument, balance scales, to see the difference. Your task is to learn which ball is different than the others and whether it is lighter or heavier using the least possible number of weighings.//
+//We have 12 balls, all are exactly the same in all respects, with a single exception. One of the balls is either slightly lighter of slightly heavier that the other 11. (And we do not know whether it is lighter or heavier). "Slightly" means that the difference is very small and you need to use an accurate weighing instrument, balance scales (see the picture), to see the difference. Your task is to learn which ball is different from the others and whether it is lighter or heavier using the least possible number of weighings.//
+Note that you can only weigh the balls against other balls; no weighing of balls vs anything else is possible.