You have 9 snooker balls. All appear identical. One of them however is a slightly different weight to the others but feels the same to your hand. This ball is either lighter OR heavier. You don’t know. To determine the odd ball you have a balance scales. You must find the ball in three weighings or less. How can you do it? Answers must explain FULLY how this is done.
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i know this problem but with 15 snooker balls and in four weighings narrow it down to which ball is odd and whether it is heavier or lighter.