![Five different books (P, Q, R, S, T) are to be arranged on a shelf. The books R and S are to be arranged first and second, respectively from the right side of the shelf](https://www.gkseries.com/blog/wp-content/uploads/2023/08/Five-different-books-P-Q-R-S-T-are-to-be-arranged-on-a-shelf.-The-books-R-and-S-are-to-be-arranged-first-and-second-respectively-from-the-right-side-of-the-shelf.jpg)
Q. Five different books (P, Q, R, S, T) are to be arranged on a shelf. The books R and S are to be arranged first and second, respectively from the right side of the shelf. The number of different orders in which P, Q and T may be arranged is .
(A) 2
(B) 6
(C) 12
(D) 120
Ans: 6
Solution:
Here R and S are fixed in 1st and 2nd place from right.
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/Screenshot-510.png)
Therefore arrangement of
P,Q,T= 3P3=3!=6