The hip is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone.The ball is the femoral head, which is the upper end of the femur (thighbone).he hip is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone.
Most of us carry credit cards and ATM cards. These, typically, have sixteen digits on the front. These digits are the unique account number for the card. For obvious reasons, just any sixteen digits will not work, they follow pattern. The first few characters of the card number describe the type of card.
Credit card numbers are not random. They can be checked by a mathematical formula for validity. Each kind of credit card uses a slightly different rule. For details, see the source code in FormChek.js. This sample form checks credit cards for validity, so you must enter a valid credit card number. Use one of the sample numbers from this list: