ME Mock Test

Question

Consider the following statements given below:
S1 : In inverted page table, size of the page table depends only on the number of processes.
S2 : Race condition is occure if mutual exclusion is satisfied.
S3 : Using semaphore to achieve the synchronization between two or more process always guarantee mutual exclusion.
The number of incorrect statements are 

Comments

S1: Incorrect, The size of Inverted page table depends on no.of pages.

S2: Incorrect, Race condition doesn't occur if mutual exclusion is satisfied.

S3: Incorrect, Using semaphore only in certain fashion will gaurantee mutual exclusion.