It's necessary that 1 student is selected from each state.
So number of ways 1 student can be selected from 1 state = 3
So number of ways 1 student can be selected from each of the 3 state is 3*3*3 = 27
3 of the 9 have now been selected and 6 remain; out of which 2 need to be selected.
This can be done in 6C2
So the answer is 27*6C2 = 405
If the 5 people were to be selected for 5 different posts, then the answer would be 405*5!
In a Normal Distribution, only the Average 'Stand Out'