Number of ways in which 15 billiard balls be arranged in a row if 3 are identical red , 7 are identical white and remaining are identical black balls is

The number of ways in which 17 billiard balls be arranged in a row if 7 of them are black, 6 are red, 4 are white is

The number of ways in which 9 identical balls can be placed in three identical boxes is

The number of ways in which 9 identical balls can be placed in three identical boxes is

If the number of ways in which a selection of 100 balls can be made out of 100 identical red balls, 100 identical blue balls and 100 identical white balls is

In how many ways can 13 billiard balls be arranged, if 6 of them are green, 4 red and 3 black?