The Gravitational Force (between two spherical objects)

A bowling ball (mass=7.2 kg, radius=0.11m_ and a billiard ball (mass=.38kg, radius= .082m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

I figured I was supposed to use F=Gm1m2/r^2 but I didn't know how to use the equation because the problem gave me to radii.

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