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I have computer science background and I am trying to understand the equation below.

The average value of the G + C content of a protein-coding region is given by :

(G+C)= $\sum_{\alpha} (I_\alpha *f _\alpha$ )/3

$I_\alpha$ = Maximum number of nucleotides C and G that appear in one of the synonomous codons for given amino acid

$f_\alpha$ = Frequency of amino acid α.

Where does the 3 in the denominator come from ?

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Each codon codes for one amino acid and every codon contains 3 nucleotides.

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