Let the oxidation state of the transitio...

Let the oxidation state of the transition element of compound `K_2Cr_2O_7,KMnO_4 and K_2FeO_4` be X,Y, and Z respectively, calculate `X+Y+Z`.

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`K_(2) overset(+8)(Cr_(2))O_(7)" "K overset(+7)(Mn)O_(4) " " K_(2)[overset(+6)(Fe)O_(4)]`

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