In how many ways 12 boys can be seated on 10 chairs in a row so that two particular boys always take seat?

In how many ways 6 girls can be seated in two chairs ?

In how many ways can 7 boys be seated at a round table so that two particular boys are next to each other

In how many ways can 6boys be seated at a round table so that two particular boys are next to each other is

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 boys and 2 girls be seated in a row so that two giirls are together ?

In how many ways 4 boys and 3 girls can be seated in a row so that they are alternate.

In how many ways 4 boys and 3 girls can be seated in a row so that they are alternate?