Question

show that the number 231 and 396 are not co prime

Answer 1

We know that Two numbers are Co-prime if they have no common factors other than 1.

$$\begin{gathered} \mathrm{The}\mathrm{prime}\mathrm{factorisation}\mathrm{of}231\mathrm{and}396\mathrm{is}: \\ 231=3\times 7\times 11 \\ 396=2\times 2\times 3\times 3\times 11 \\ \mathrm{HCF}=3\times 11=33 \\ \mathrm{Hence},231\mathrm{and}396\mathrm{are}\mathrm{not}\mathrm{coprime}. \end{gathered}$$