# Recent questions tagged permutation

1
The number of ways of arranging 10 books on a shelf such that 2 particular books are always together is
2
How many 3 letter words can be formed from word PRACTICES?
3
How many ways $10$ roses can be distributed among $3$ girls?
4
Choose the correct option: Boxes numbered $1, 2, 3, 4$ and $5$ are kept in a row, and they are to be filled with either a red or a blue ball, such that no two adjacent boxes can be filled with blue balls. How many different arrangements are possible, given that all balls of a given colour are exactly identical in all respects? $8$ $10$ $15$ $22$
5
A man has nine friends, four boys and five girls. In how many ways can he invite them, if there have to be exactly three girls in the invitees? $320$ $150$ $80$ $200$
1 vote
6
Out of 100 students, 10 students used to drink milk(M), coffee(C) and Tea(T); 20M and C; 30C and T; 25M and T; 12M only; 5C only and 8T only. The number of students who did not drink any of this is a) 18 b) 24 c) 20 d) 16