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 second, respectively from the right side of the shelf. The number of different orders in which P, Q and T may be arranged is ________.

Five different books (P, Q, R, S, T) are to be arranged on a shelf. Th

1.	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 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
Answer» C. 12

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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 second, respectively from the right side of the shelf. The number of different orders in which P, Q and T may be arranged is ________.

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