Mathematics - Permutation & Combination Question with Solution | TestHub

The units digit has 3 choices: 2,4,6. Choose and arrange 5 of the remaining 6 digits in the other places: $\left(\genfrac{}{}{0ex}{}{6}{5}\right)5!$. Thus $3\left(\genfrac{}{}{0ex}{}{6}{5}\right)5!=2160$.