Question

You are given the digits 7,2,5,9, and you can only use each digit once in each number.
Write down all the 3-digit even numbers less than 600 that you can form.

Answer 1

Since 2 is the only even digit, and cannot be repeated, it must be the units digit. The first digit must be 5.
So the only possible numbers are 572 and 592

Answer 2

275, 279, 527, 529, 572, 579.

Answer 3

Since they are both less than 600, the answer is:

572, 592.