1. Every body in a room shakes hands with every body else. The total number of hand shakes is 66. The total number of persons in the room

2. The number of different permutations of the word BANANA, is

3. The number of arrangements which can be made using all the letters of the word LAUGH, if the vowels are adjacent, is

4. The number of ways in which any four letters can be selected from the word 'CORGOO' is

5. The letters of the word RANDOM are written in all possible orders and these words are written out as in a dictionary, then the rank of the word RANDOM, is

6. Total number of four digit odd numbers that can be formed by using 0,1,2,3,5,7, is

7. The number of permutations of all the letters of the word 'EXERCISES', is

8. The number of committees of 5 persons consisting of at least one female member, that can be formed from 6 males and females, is

9. The number of ways in which a team of eleven players can be selected from 22 players including 2 of them and excluding 4 of them, is

10. In a football championship, 153 matched were played.  Every team played one match with each other. The number of teams participating in the championship, is

11. There are 10 lamps in a hall. Each one of them can be switched on independently. The number of ways in which the hall can be illuminated, is

12. In a group of boys, two boys are brothers and in this group, 6 more boys are there. In how many way, they can sit if the brothers are not to sit along with each other:

13. The number of ways in which 5 boys and 3 girls can be seated in a row so that each girl is between two boys ,is

14. The number of 4-digit even numbers that can be formed using 0,1,2,3,4,5,6 without repetition, is

15.  In a cricket championship there are 36 matches. The number of teams if each plays one match with other, is