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 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?

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

You are given 8 balls of different colour (black,white ......). The number of ways in which these balls can be arranged in a row so that the two balls of particular colour (say red and white) may never come together is-

You are given 8 balls of different colour (black,white ......). The number of ways in which these balls can be arranged in a row so that the two balls of particular colour (say red and white) may never come together is-

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

There are 5 green balls of different shades and 4 red balls of identical shades. No. of ways of arranging them in a row so that · green and red balls come alternatively is

There are 5 green balls of different shades and 4 red balls of identical shades. No. of ways of arranging them in a row so that · no two green balls are together is

There are 5 green balls of different shades and 4 red balls of identical shades. No. of ways of arranging them in a row so that · no two red balls are together is