$$\begin{gathered} \mathrm{Orthophospboric} \mathrm{acid} \left(\mathrm{A}\right) \\ \downarrow \mathrm{gentle} \mathrm{heat} 220°\mathrm{C} \\ \mathrm{Pyropbospboric} \mathrm{acid} \left(\mathrm{B}\right) \\ \downarrow \mathrm{strong} \mathrm{heat} 320°\mathrm{C} \\ \mathrm{Metaphospboric} \mathrm{acid} \left(\mathrm{C}\right) \end{gathered}$$
Metaphosphoric acid exists in polymeric form as ${\left({\mathrm{HPO}}_3\right)}_{\mathrm{n}}$, then predict the number of$\mathrm{P}-0-\mathrm{P}$ linkage in meta phosphoric acid if (n > 2).