The Total Number of all the possible ways of Selection is 9C5=126

Now if there is a certain couple which is To be Placed Together, then You can consider them One so that they will be placed Together,

Now there arise two cases.

If a couple is selected, then we need to select only 3 out of 7 that is 7C3=35

If the couple is Not selected then we need to select 5 out of 7that is 7C5=21

Therefore Probability =(35+21)/126=56/126=0.45