In a conference attended by `550` delegates tea and coffee are served. The number of delegates who drink tea is `400` and the number of delegents who drink tea only is `200`. Find `(a)` how many of them drink coffee,
`(b)` how many drink coffee only.

In a group of 50 persons, 14 drink tea but not coffee and 30 drink tea. Find: How many persons drink tea and coffee both How many persons drink coffee but not tea.

In a group of 40 persons ,10 drinks tea but not coffee and 26 drinks tea. How many drink coffee but not tea ?

In an office, every employee likes at least one of tea, coffee and milk. The number of employees who like only tea, only coffee, only milk and all the three are all equal. The number of employees who like only tea and coffee, only coffee and milkand only tea and milk are equal and each is equal to the number of employees who like all the three. Then a possible value of the number of employees in the office is

In a group of 50 people . 31 like tea , 20 like coffee and 6 like both tea and coffee. How many like coffee only ?

In a group of 25 people, 17 drink tea. Out of these 10 drink only tea. Find how many people drink coffee but not tea ? It is given that each one takes atleast one drink.

In a group of 50 people . 31 like tea , 20 like coffee and 6 like both tea and coffee. how many like tea only ?

A conference attended by 200 delegates is held in a hall. The hall has 7 doors, marked A,B,.., G . At each door, an entry book is kept and the delegates enterign through that door sign it in the order in which they enter. If each delegate is free to enter any time and through any door he likes, how many different sets of seven lists would arise in all? (Assume that every person signs only at his first entry).

In a group of 60 persons, each takes at least one of coffee or tea. If 20 of them take tea but not coffee and 35 take tea, find the number of person who take Coffee but not tea

In a group of 70 persons, 37 like coffee and 52 like tea. Each person like atleast one drink. Find how many persons like both drink ?

In a group of 50 people . 31 like tea , 20 like coffee and 6 like both tea and coffee. How many like none of tea and coffee ?