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In a building there are thirteen flats on three floors-II, III and IV. Five flats are unoccupied. Three managers, two teachers, two lawyers and one doctor occupy the remaining flats. There are at least three flats on any floor and not more than six flats on any floor. No two persons of the same profession stay on any floor. On the second floor, out of four flats, one occupant is the lawyer It has only one neighbour. One teacher lives one floor below the other teacher. The doctor is not the neighbour of any of the lawyers. No flat is unoccupied on the third floor. How many flats are there on the third floor ?

In a building there are thirteen flats on three floors-II, III and IV. Five flats are unoccupied. Three managers, two teachers, two lawyers and one doctor occupy the remaining flats. There are at least three flats on any floor and not more than six flats on any floor. No two persons of the same profession stay on any floor. On the second floor, out of four flats, one occupant is the lawyer It has only one neighbour. One teacher lives one floor below the other teacher. The doctor is not the neighbour of any of the lawyers. No flat is unoccupied on the third floor. Who among the following is the neighbour of the other lawyer ?

In a building there are thirteen flats on three floors-II, III and IV. Five flats are unoccupied. Three managers, two teachers, two lawyers and one doctor occupy the remaining flats. There are at least three flats on any floor and not more than six flats on any floor. No two persons of the same profession stay on any floor. On the second floor, out of four flats, one occupant is the lawyer It has only one neighbour. One teacher lives one floor below the other teacher. The doctor is not the neighbour of any of the lawyers. No flat is unoccupied on the third floor. What is the combination of occupants on the second floor ?

There are four teachers and five classes in a school. One teacher teaches only one class at a time. In how many ways can the teachers choose the classes?

In how many ways can a committee of 6 members e formed out of 4 teachers and 7 students when (i) one teacher is in the committee? (ii) at least one teacher is in the committee?

In how many ways can a committee of 6 members e formed out of 4 teachers and 7 students when (i) one teacher is in the committee? (ii) at least one teacher is in the committee?

An effective science teacher is one who can-