Permutation is an ordered arrangement of a group of objects. 1  The permutation of n objects taken r at a time is represented as nPr. 2  The permutation or arrangement of 9 different balls in 3 different rows can be done in 9P3 = 504 ways.  The permutation of n objects taken all at a time is represented as nPn = n!.
Collagen is a protein that is part of cartilage, bone, and other tissues in animals and humans. People use collagen from chickens for medicine. Chicken collagen is used to treat joint pain associated with many types of arthritis and surgery, as well as back pain, neck pain, and pain following injury.
Collagen and Hair Care. Collagen is a protein and most people associate collagen with skin. While it is true that collagen is the support structure for skin, giving skin its resilience. Collagen is a very important protein for our whole body including our hair. Collagen is one of the proteins found in most connective tissues, including cartilage, bone, and skin. Collagen is a protein that makes up about 30 percent of our body.