At a particular time of computation the value of a counting semaphore is 7. Then 20 P operations and 15 V operations were completed on this semaphore. The resulting value of the semaphore is :
Explanation: Value of a counting semaphore = 7
After 20 P operations value of semaphore = 7 – 20 = -13
After 15 V operations value of semaphore = -13 + 15 = 2
So, option (B) is correct.
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