Groups of numbers are collections of numbers that have a common purpose or meaning. The term 'MEDLEYS' is used to describe a combination of different elements, such as numbers, that are put together to form a single unit. MEDLEYS can be used to represent a variety of things, such as musical compositions, collections of words, or even groups of numbers. In the context of mathematics, MEDLEYS are often used to represent sets of numbers that have a specific purpose or meaning. For example, a medley of prime numbers could be used to represent a sequence of numbers that are all prime.