+161 How many positive four-digit even numbers can be written without using any of the digits 0, 1, 2, 3 or 4?
+37159 choices 5 6 7 8 9
position 1 5 choices
position 2 5 choices
position 3 5 choices
position 4 5 choices
5 x 5 x 5 x 5 = 625 possible numbers EVEN numbers end in 6 or 8 ( 2 out of 5 choices)
2/5 x 625 = 250 evens
