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  2. What is a credit card security code? - AOL

    www.aol.com/finance/credit-card-security-code...

    A credit card security code is a three- or four-digit code that’s unique to your card. In case a merchant asks, the security code goes by a few different names , mainly the: Card Verification ...

  3. Preorder - Wikipedia

    en.wikipedia.org/wiki/Preorder

    Both of these are special cases of a preorder: an antisymmetric preorder is a partial order, and a symmetric preorder is an equivalence relation. Moreover, a preorder on a set X {\displaystyle X} can equivalently be defined as an equivalence relation on X {\displaystyle X} , together with a partial order on the set of equivalence class.

  4. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    The card security code is not encoded on the magnetic stripe but is printed flat. American Express cards have a four-digit code printed on the front side of the card above the number. Diners Club, Discover, JCB, Mastercard, and Visa credit and debit cards have a three-digit card security code. The code is the final group of numbers printed on ...

  5. Partially ordered set - Wikipedia

    en.wikipedia.org/wiki/Partially_ordered_set

    However some authors use the term for the other common type of partial order relations, the irreflexive partial order relations, also called strict partial orders. Strict and non-strict partial orders can be put into a one-to-one correspondence , so for every strict partial order there is a unique corresponding non-strict partial order, and ...

  6. Payment card number - Wikipedia

    en.wikipedia.org/wiki/Payment_card_number

    A payment card number, primary account number (PAN), or simply a card number, is the card identifier found on payment cards, such as credit cards and debit cards, as well as stored-value cards, gift cards and other similar cards. In some situations the card number is referred to as a bank card number. The card number is primarily a card ...

  7. Bettors backing favorites in each of Sunday's NFL wild-card ...

    www.aol.com/sports/bettors-backing-favorites...

    Bettors like all but one home team in the four NFL wild-card games remaining. Ahead of Sunday’s action, all three home teams are getting the majority of bets and money against the spread at BetMGM.

  8. Weak ordering - Wikipedia

    en.wikipedia.org/wiki/Weak_ordering

    A total order is a total preorder which is antisymmetric, in other words, which is also a partial order. Total preorders are sometimes also called preference relations . The complement of a strict weak order is a total preorder, and vice versa, but it seems more natural to relate strict weak orders and total preorders in a way that preserves ...

  9. What’s the difference between a cashier’s check and a money ...

    www.aol.com/finance/difference-between-cashier...

    The U.S. Postal Service charges just $2.35 for a money order up to $500 and $3.40 for money orders from $500.01 to $1,000. Walmart charges a maximum fee of $1. Chase, the largest bank in the U.S ...