Three masses m1m2 and m3 are attached to a string as shown in the figure. All three masses are held at rest and then released. To keep m3 at rest the condition is
A
4m1+1m2=3m3
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B
m1+m2=m3
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C
4m3=1m1+1m2
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D
1m1+2m2=3m3
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