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Problem of the Week:
Bored? Have too much free time? Or just looking for an interesting math problem?
Check out the problem of the week!
Counterfeit Coin:
You have a balance scale and 12 coins, 1 of which is counterfeit.
The counterfeit weighs less or more than the other coins.
Can you determine the counterfeit in 3 weighings, and tell if it is heavier or lighter?
(Facebook discussion board.)
(Original source on the web.)
(Original book source.)
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