Use a high precision caliper to measure the diameter and thickness of the coin. Use a scale that is accurate to within 0.01 grams to measure the weight of the coin. Compare your results to that of the genuine coin. If they are significantly off, you may have a counterfeit coin.
How do you solve fake coin problems?
If two coins are given, put one coin on each pan. The higher pan contains the fake lighter coin. If 3 coins are given and one among them is known to be a fake lighter coin, put one coin on each pan and leave the third coin aside. If the pans balance, then the third coin is the lighter fake coin.
Can you solve the counterfeit coin riddle answer?
Take two of those three coins and weigh them against each other. If the balance tips then the lighter coin is the odd one out. If the two coins balance then the third coin not on the balance is the odd one out and it is lighter.
Are there fake NGC coins?
Although the vast majority of NGC holders in the marketplace are genuine, there are occasionally reports of counterfeit or tampered NGC holders. Likewise, there are some scams that involve soliciting coin sales.
Can you fake coins?
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 to figure out if a coin is real or fake?
The following diagram explains the procedure. The middle case (G1) = (23) is self explanatory, i.e. 1, 2, 3 are genuine and 4th coin can be figured out lighter or heavier in one more trial. The left side of tree corresponds to the case (G1) < (23). This is possible in two ways, either 1 should be lighter or either of (2, 3) should be heavier.
What do you pick if two coins are counterfeit?
If two coins are counterfeit, this procedure, in general, does not pick either of these, but rather some authentic coin. For instance, if both coins 1 and 2 are counterfeit, either coin 4 or 5 is wrongly picked.
Can you put a fake coin on a balance scale?
Solution. One weighing. Place one coin on one side of the balance scale, one on the other, and put one coin aside. If the scale balances, the coin that we put aside is fake. If one of the sides of the scale is heavier, the fake coin is on that side. Example 2. One of the nine identically looking coins is fake.
How many trials to find the odd coin in a COIN puzzle?
In other-words, in k trials we can examine upto 3k coins, if we know whether the defective coin is heavier or lighter. Given that a coin is heavier, verify that 3 trials are sufficient to find the odd coin among 12 coins, because 3 2 < 12 < 3 3. We are given 4 coins, out of which only one coin may be defective.
