Gateforum Test series

Question

Suppose 2 process P1 and P2 are as follows:

Comments

it will print (ab+ba)*

but it is given in execution "Execution order is 1st P1 then P2", then answer should be (abba)*, but this is incorrect, there is actually no such order possible.

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There assumption is incorrect how can we assume like that 

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yes, that's what i said.

Answer 1

a and c are correct answers

Comments

both semaphore variables initialized  to 1 then P2 may be executed before P1 then sequence will be “baab” and it is not there in C

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But it is possibility

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we will have to consider it also

Answer 2

Correct option: D none of these

String pattern generated is : ab(ab+ba)*