Question 1118501
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1-digit numbers: 4  (0, 2, 4, and 6)
2-digit numbers: 4*6 = 24  (choice of 4 digits for the last digit; choice of the 6 others for the first)
3-digit numbers: 4*6*5 = 120
4-digit numbers: 4*6*5*4 = 480
5-digit numbers: 4*6*5*4*3 = 1440
6-digit numbers: 4*6*5*4*3*2 = 2880
7-digit numbers: 4*6*5*4*3*2*1 = 2880<br>
total: 7828