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Question

Ethylenediamine displaces H2O in the complex [Fe(H2O)6]3+ in three steps.
[Fe(H2O)6]3++3en[Fe(en)3]3++6H2O
Stepwise formation constants are
logK1=4.34
logK2=3.31
logK3=2.05
Overall formation constant is A×10B.
A+B is ............

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