In a $∆$ABC, $\overline{\mathrm{OA}}=\overline{\mathrm{a}}, \overline{\mathrm{OB}}=\overline{\mathrm{b}}, \overline{\mathrm{OC}}=\overline{\mathrm{c}}$. If $(\overline{\mathrm{a}}-\overline{\mathrm{b}}).(\overline{\mathrm{c}}-\overline{\mathrm{b}})=0 ,$ then P.V. of the circumcentre is

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