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If a man has 8 balls,and out of eight one ball is lighter than other seven.if he has a balance and had two chances.how will he find the lighter one??

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Put 3 balls on each side of the scale. If the scales balance then weigh the remaining 2 balls and this will show the lighter one. If on the first weigh (3 balls each side) the scales do not balance- then take the three ball from the lighter side and put two on the scales (one each side) and keep hold of the remaining one. If the scales balance then you are holding the lighter ball. If not the scales will show which is the lighter ball. You can use the same logic for up to 9 balls.

Posted on Jul 07, 2010

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