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A solid sphere of a radius R gravitationally attracts a particle placed at 3R from its center with a force F1. Now a spherical cavity of radius R/2 is made in the sphere (as shown) and the force become F2. The value of F1:F2 is:
A) 41 : 50
B) 36 : 25
C) 50 : 41
D) 25 : 36

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