randomness

     If something is really randomly assorted, for instance the numbers on a license plate, the colors on a quilt, or the cards in a deck of playing cards, each possible combination is no more or less likely than any other.
      If the numbers on the license plate are chosen at random from the digits 1 through 10, using every possible combination of 6 digits, some of the combinations will not appear to be random. Sooner or later, the number 111111 will come up, for example. Or the number 222222. If a programmer wants to set up a program to choose random sets of numbers, the programmer would have to deliberately remove combinations that didn't seem random enough.
     This is easy to understand if you play cards. If a computer program is devised to deal every possible combination of hands, sooner or later it will deal a hand that seems to come from an unshuffled deck--because that would be one of the possibilities. So the programmer would have to eliminate these combinations, or the shuffling and dealing program would not seem random to the players using it.
     If a quilter puts a lot of squares of different colors into a bag, and decides to choose them at random,without looking, some of them will be the same color as the square that went before--there will be two and three of the same color scattered in places throughout the quilt. Many quilt makers would put back the square of the same color and choose another, so that the quilt would look more random, even as it became less random.