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You have ten stacks of identical
looking gold coins.
Nine of the stacks contain all real gold
coins, and one of the stacks is made up
entirely of fake gold coins. Each real gold
coin weighs exactly 1 gram, while each fake
gold coin weighs exactly 1.1 grams. Using
a scale, how can you determine the stack
of fake coins?
RULES: You can use to take
only one measurement. For example, you stack
what you want on the scale, press a button,
and get a readout of the weight. You can
do this only once, and once the readout
is displayed it does not change if you remove
any coins. You can mix the coins up in their
stacks, separate them, mark them, whatever.
How do you find out for sure which stack
contains the fake gold coins?
click
here for the answer
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