Question

The access code for a​ car's security system consists of sixsix digits. the first digit cannot be zerozero and the last digit must be oddodd. how many different codes are​ available?

Answer 1

There are six digits. The first can be anything but 0. There are 9 other choices.
Are repetitions allowed? Is 999999 permitted.

Repetitions allowed.
9 * 10 * 10 * 10 * 10 * 5 The last digit must be odd.
450,000 <<<< answer.

No repetitions
Sorry this requires more thought.