Answer :
The gravitational force at the center is equal to the vector sum of all the forces acting on it.
The distance between the center particle with others, 
The force acting between particles of mass m and center particle is 
The force acting between particles of mass 2m and center particle is 
Similarly,
between particles of mass 3m and center particle is 
And between particles of mass 4m and center particle 
Cancelling out the vertical and horizontal components, the net force is
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