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If (mr ,1//mr),r=1,2,3,4, are four pairs...

If `(m_r ,1//m_r),r=1,2,3,4,` are four pairs of values of `xa n dy` that satisfy the equation `x^2+y^2+2gx+2fy+c=0` , then the value of `m_1, m_2, m_3, m_4` is `0` b. `1` c. `-1` d. none of these

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