If the value of Avogadro number is 6.023 × 10 23   m o l – 1 and the value of Boltzmann…

$\text{K}=\frac{\text{R}}{{\text{N}}_{\text{A}}}$

$\therefore R={\text{k.N}}_{\text{A}}$

$=\text{6.023}\times {\text{10}}^{\text{23}}\times \text{1.380}\times {\text{10}}^{-23}{J.\; mol}^{-1}{\text{k}}^{-1}$

There are 4 significant figures in each term.

Hence, these be 4 significant figure in R.