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Counting Sand (Posted on 2005-04-07) Difficulty: 2 of 5
Count Sandini calls himself the greatest "Sand Counter" in the world. Show him a bucket filled of sand, and in a few seconds he will tell you how many grains of sand are there!

Can you devise a (fairly quick) test to prove whether he can actually do so, or if he's a fraud?

See The Solution Submitted by Federico Kereki    
Rating: 3.3333 (3 votes)

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Solution Another similar method | Comment 5 of 9 |
As others have noted, the best way seems to be to get Sandini to count a large amount of sand, and then remove a counted amount of grains.  But why do I have to count the number of removed grains?  Let Sandini do the counting.  Of course, don't let him know the relationship between the three amounts of sand that he counts.
  Posted by Tristan on 2005-04-07 22:40:25
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