Adjoining figure shows two blocks A and ...

Adjoining figure shows two blocks A and B pushed against the wall with the force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of bloods to be at rest against the wall:

F should be more than the weight of P & Q

F should be equal to the weight of P & Q

F should be less then the weight of P & Q

The system cannot be in equilibrium

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