Question

the number 3^13-3^10 is divisible by what number

Answer 1

$$\begin{gathered} 3^{13}-3^{10} \\ =3^{10}\left(3^3-1\right) \\ =3^{10}\times 26 \\ \mathrm{One}\mathrm{of}\mathrm{the}\mathrm{number}\mathrm{by}\mathrm{which}\mathrm{it}\mathrm{is}\mathrm{divisible}\mathrm{is}26. \end{gathered}$$