read this(2nd answer by osman) : https://stackoverflow.com/questions/15117155/show-how-counting-semaphores-can-be-implemented-using-only-binary-semaphores-and , hope this will help.

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Here A is the Option i get it.

But i cant understand how Counting Semaphores can be implemented using Binary Semaphores and Machine instructions.

Some light over here please....

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