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In how many different ways can a person get his two guests stayed in 9 rooms when only one guest stays in one room?
1. 72
2. 6
3. 36
4. 81

1 Answer

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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.

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