[" If "7" white,"6" black and "1" red ball is arranged in a row,"],[" the probability that no two balls of the same colour "],[" are adjacent is "]

3red and 4 white balls of different sizes are arranged in a row at random.The probability that no two balls of the same colour are together is

Seven white balls and three black balls are randomly arranged in a row. The probability that no two black balls are placed adjacently is

The number of ways in which 20 different white balls and 19 different black balls be arranged in a row,so that no two balls of the same colour come together is

5 red balls and 4 black balls of different sizes are arranged in a row at random. The probability that no two balls of the same colour come together is

Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals

Seven white balls and three black balls are randomly placed in a row. What is the probability that no two black balls are placed adjecently ?

If 2 balls are drawn from 4 white and 6 black balls, then probability that both are of the same colour is