Homework Help: algebra,biology

Posted by Holly on Wednesday, September 23, 2009 at 8:56am.

<biology knowledge background>:
two Cys(amino acid's name) can form a disulfide bond.
<the question>:
If the eight Cys residues in ribonuclease are allowed to combine at random forming four disulfide bonds, there are 105 different combinations. Show mathmetically this is the case.

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