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In the arrangement , shown below pulleys...

In the arrangement , shown below pulleys are massless and frictionless and threads are inextensible , block of mass `m_(1)` will remain at rest if

A

`4/m_1=1/m_2+1/m_3`

B

`1/m_1=1/m_2+1/m_3`

C

`1/m_3=2/m_2+3/m_1`

D

`m_1=m_2=m_3`

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