see P and S are to be fixed at the end

then remaining letters inside can be permutated..

so it's 10!.

since s can also come at first place and P at last. so, it's 2*10!.

now see, we have T which is occurring 2 times so we have no way to distinguish between these two Ts.

So, we do division by 2!.

hence, the ans is : 10!