Another simple math question im having trouble with attachment

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

How do you use the elimination method for this question? explain, because i really want to understand!

You have just applied, and have been approved for a $58,000 mortgage. the rate quoted to you by the lender is 6.1% for a 30 year fixed mortgage. determine how much of your third month’s payment goes towards the principal. $56.65 $56.93 $57.22 $57.51