What is functionality factor? Assuming a value of $0\mathrm{.}999$ for $p($extent of reaction$),$

what would be the DP of a polyester prepared from equimolar quantities of

difunctional reactants in the presence of $1\mathrm{.}5$mol$\%$ of acetic acid? Let the mol$\%$

difunctional reactants both be $98\mathrm{.}5.$

$[$Given$,DP=\frac{2}{2-p{f}_{\text{a}\text{v}\text{g}}}]$