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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 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 ______.

  1. $2$
  2. $6$
  3. $12$
  4. $120$
in Numerical Ability by (1.4k points)
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