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. $120$

edited

Placing 3 objects in 3 available space (since out of 5 last 2 from right are occupied) giving 3! ways to arrange i.e 6

Option is correct.

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