three particles of masses 4m, m and 9m are kept along a straight line as shown above. If net gravitational force acting on mass m is zero, then
(1)r1=r2
(2)r1/r2=2/3
(3)r1/r2=4/9
(4)r1/r2=9/4
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R1=R2
R1=/R2=2/3
R1/R2=9/4
R1/R2=9/4
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