Correct Answer - Option 3 : 36
Given:
Number of rooms = 9
Number of guests = 2
Calculation:
The first guest can choose any room out of 9 rooms.
Now for the second guest, only 8 rooms remain to choose from.
Number of ways in which they can choose the rooms = 9C2 = (9 × 8)/(2 × 1)
The number of ways = 36 ways.