[" ut of "15" balls,of which some are white and "],[" ack,how many should be white so that "],[" is in which the balls can be amanged in "],[" areatest possible? It is assumed that the "],[" br 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?

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?

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?

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 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 21 identical white balls and 19 identical black balls be arranged in a row so that no 2 black balls are together?

A box contains 3 red, 4 white and 2 black balls. The number of ways in which 3 balls can be drawn from the box, so that at least one ball is red , is ( all balls are different )

A box contains 3 red, 4 white and 2 black balls. The number of ways in which 3 balls can be drawn from the box, so that at least one ball is red , is ( all balls are different )