In how many ways can 4 red, 3 yellow and 2 green discs be arranged in a row if the discs of the same colour are indistinguishable?

In how many ways can 5 girls and 5 boys be arranged in a row if all boys 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?

In how many ways can the letters of the following words be arranged: RADIO

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.

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 6 students and 4 teachers be arranged in a row so that no two teachers are together ?

In how many ways can the letters of the following words be arranged: FOREIGN?

In how many ways can 7 boys and 2 girls be seated in a row so that two giirls are together ?

In how many ways can 7 green and 5 yellowballs be arranged in a striaght line when 2 yellow balls are not together?