Coin counterfeiting of valuable antique coins is common; modern high-value coins are also counterfeited and circulated. Counterfeit antique coins are generally made to a very high standard so that they can deceive experts. This is not easy and many coins still stand out.
How many weighings of a balance scale are needed to find a counterfeit coin among 12 coins?
The problem is as follows: Given 12 coins, one of which is counterfeit, use a balance to determine the counterfeit in three weighings, where the counterfeit coin may be either lighter or heavier than the other coins.
Do fake coins work in vending machines?
A slug is a counterfeit coin that is used to make illegal purchases from a coin-operated device, such as a vending machine, payphone, parking meter, transit farebox, copy machine, coin laundry, gaming machine, or arcade game.
Is selling fake coins illegal?
The new law makes it illegal to sell imitation coins unless they are clearly marked as a “copy.” It makes it a crime to aid the manufacturer, importer, or seller of forged items. Individuals can file civil lawsuits against sellers of fake coins, buttons, and posters to try to recoup costs.
Are there fake silver eagles?
The Silver Eagle has a face value of $1, meaning it technically is currency (and making a replica and passing it off as real is counterfeiting and falls under the jurisdiction of the Secret Service). Each Silver Eagle is one troy ounce of fine silver (. 999% pure silver) weighing exactly 31.103 grams.
Can you go to jail for having fake money?
Federal Crimes Under federal law, the use or attempted use of counterfeit currency is illegal if the person has the intent to defraud the recipient. A conviction for the offense carries up to 20 years in prison and a fine.
Can you make a coin weigh the same?
The problem is, we’re only allowed the use of a marker (to make notes on the coins) and three uses of a balance scale. Here are the detailed conditions: 1) All 12 coins look identical. 2) Eleven of the coins weigh exactly the same. The twelfth is very slightly heavier or lighter.
How can you tell if a coin is a counterfeit?
The methods presented below are not foolproof but can help identify the more obvious counterfeit coins. Since silver, gold, and copper coins are not attracted to a magnet, this can be a simple test to tell if the coin has some iron content.
Is it possible to solve the counterfeit coin puzzle?
Can You Solve the Counterfeit Coin Puzzle? Mathematicians have long plagued humankind with a style of puzzle in which you must weigh a series of items on a balance scale to find one oddball item that weighs more or less than the others.
How can you tell the weight of a twelfth coin?
The twelfth is very slightly heavier or lighter. 3) The only available weighing method is the balance scale. It can only tell you if both sides are equal, or if one side is heavier than the other. 4) You may use the scale no more than three times. 5) You may write things on the coins with your marker, and this will not change their weight.
