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If a room have capacity of 20 persons...

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If a room have capacity of 20 persons...9 persons already inside the room....then what will be the value of semaphore integer.
A. 20
b. 9
c. 11
d. 29
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Depends on implementation- question is incomplete. 

Assuming a counting semaphore is used to indicate the availability of a space in the room we can do as follows:

Semaphore value x- denote x person can enter the room. 

So, initial value of semaphore here is 20 and when 9 person are inside, it becomes $20-9=11.$

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