What is the coefficient of Co after balancing the following redox reaction using the oxidation number method?

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What is the coefficient of Co after balancing the following redox reaction using the oxidation number method? 

Co2O3(s) + CO(g) → Co(s) + CO2(g) 

(a) 1

(b) 2

(c) 3

(d) 6

(e) None of the above.

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