A class has tree teachers, Mr. `X`, Ms.`Y` and Mrs.`Z` and six students `A`, B`, `C`, `D`, `E`, `F`. Number of ways in which they can be seated in a line of `9` chairs,if between any two teachers there are exactly two students is

A class has three teachers, Mr. P , Ms. Q, and Mrs. R and six students A,B,C,D,E,F. Number of ways in which they can be seated in a line of 9 chairs, if between any two teachers there are exactly two students, is k !(18), then value ofk is ________.

Number of ways in which 4 students can sit in 7 chair in a row, if there is no empty chair between any two students is :

There are 6 students A,B,C,D,E,F. In how many ways can they be seated in a line so that C and D do not sit together?

Find the number of ways in which six persons can be seated at a round table,so that all shall not have the same neighbours n any two arrangements.

Number of ways in which 11 letters A,B,C,D,E,F,X,X,X,Y, Y can be arranged

There are 6 students A,B,C,D,E,F. In how many ways can a committee of 4 be formed so as to always include C?

A team of four students is to be selected from a total of 12 students.The total number of ways in which the team can be selected such that two particular students refuse to be together and other two particular students wish to be together only is equal to a.220 b.182 c.226 d.none of these

Six teachers and six students have to sit round a circular table such that thereis a teacher between any two students.The number of ways in which they can sit is