IN how mny ways can 18 white and 19 black balls be arranged in a row so that no two white balls may be together? It is given that balls ofteh same colour are identical.

In how many ways can 3 red and 4 black balls be arranged in a row?

In how many ways can 12 white and 8 black balls be arranged in a row if no two black balls are together?

In how many ways 4 different white balls and 6 different black balls be arranged in a row that no two white balls are together ?

In how many ways can 7 red and 6 black balls be arranged in a row, if no two black balls are together?

Find the number of ways by which 4 green, 3 red and 2 white balls can be arranged in a row such that no two balls of the same colour are together. All balls of the same colour are identical.

The number of ways of arranging m white and n black balls in a row (mgtn) so that no two black are placed together, is

In how many ways can 5 red and 4 white balls be drawn from a bag containing 10 red and 8 white balls

Out of 10 white, 8 black and 6 red balls, the number of ways in which one or more balls can be selected is (assuming balls of the same colour are identical)

Out of 15 balls, of which some are white and the rest are black, how many should be white so that the number of ways in which the balls can be arranged in a row may be the greatest possible? It is assumed that the balls of same color are alike?

Out of 15 balls, of which some are white and the rest are black, how many should be white so that the number of ways in which the balls can be arranged in a row may be the greatest possible? It is assumed that the balls of same color are alike?