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Find the equilibrium constant for the re...

Find the equilibrium constant for the reaction
`Cu^(2+)+ 1n^(2+) Cu^(+) + 1n^(3+)`
Given that `E_(CU^(2+)//CU^(+))^(@) = 0.15V, E_(In^(2+)//1n^(+)) = -0.4V`
`E_(1n^(3+)//1n^(+))^(@) = - 0.42V`

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