In how many ways can 6 balls of different colours, namely black, white, blue, red, green and yellow be arranged in a row in such a way that the black and white balls ar never together?

You are given 6 balls of different colours (black, white, red, green, violet, yellow), in how amny ways can you arrange them in a row so that black and white balls may never come together?

You are given 6 balls of different colours (black, white, red, green, violet, yellow), in how amny ways can you arrange them in a row so that black and white balls may never come together?

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

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 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 3 red and 4 black balls be arranged in a row?