... and again sam is bothering me with another mind game, take a look:

The Task:
You got twelwe coins. They all look the same.

Eleven of them are real gold.
One of them is a fake.
They only differ by their weight, but it is only a slight difference.

You have a scale, you know, all fashion two platters scale on which you can only compare stuff's weight, not have an actual value.
Question is:

How can you determine the fake coin in three steps ?

Warning: it is extremely hard. Even when you got the solution, you can only remember of it for so long. I forgot the details, but it is a VERY interesting problem of efficiency optimization.
p.s.: don't forget, u don't know if the coin is heavier or lighter then the other coins ...

have phun,

good day and good luck,
fil