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A red box is a phreaking device that generates tones to simulate inserting coins in pay phones, thus fooling the system into completing free calls. In the United States, a nickel is represented by one tone, a dime by two, and a quarter by a set of five. Any device capable of playing back recorded sounds can potentially be used as a red box.
In Canada, coin roll hunters obtain rolls of nickels, and sometimes dimes and quarters. Dimes and quarters didn't have high mint numbers until silver was discontinued in the middle of 1968. After 1968, coins were minted in very high numbers, making silver coins uncommon, plus the introduction of silver-rejecting bank machines took many silver coin
Currency: United States dollar. A roll of 40 nickels worth $2 A pile of coin wrappers, one for quarters with a total face value of 10 U.S. dollars. Each denomination has a different amount found in a roll and are color-coded by denomination. See below:
The scammer will roll coins of lesser value or slugs of no value, or less than the correct number of coins in a roll, then exchange them at a bank or retail outlet for cash. To prevent these problems, many banks will require people turning in coins to have an account, and will debit the customer's account in the event of a shorted roll.
Between 1999 and 2008, a new state quarter was released every ten weeks. Each state’s quarter featured an image representing it, along with the year it entered the United States Union or ...
The quarter, formally known as the quarter dollar, is a coin in the United States valued at 25 cents, representing one-quarter of a dollar. Adorning its obverse is the profile of George Washington , while its reverse design has undergone frequent changes since 1998.
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Coin values can be modeled by a set of n distinct positive integer values (whole numbers), arranged in increasing order as w 1 through w n.The problem is: given an amount W, also a positive integer, to find a set of non-negative (positive or zero) integers {x 1, x 2, ..., x n}, with each x j representing how often the coin with value w j is used, which minimize the total number of coins f(W)