Consider the following reactions
$\begin{array}{l}\mathrm{A}\rightleftharpoons 2\mathrm{B};\mathrm{K}=10\dots \left(\mathrm{I}\right)\\ \mathrm{B}\rightleftharpoons \mathrm{C};\mathrm{K}=2\dots \left(\mathrm{II}\right)\end{array}$
Equilibrium constant for $2\mathrm{C}\rightleftharpoons \mathrm{A}$ will be 
 

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