I would like to give answer in different way :
Here , Total Digit are 0 ,1,2,3,4,5,6,7,8,9.
Now For three Digit number : a1-a2-a3
For a3 digit possible numbers are : 1,3,7,9 ---- 4.
for a2 Digit possible numbers are (Except 5) :0,1,2,3,4,5,6,7,8,9 -->9
For a1 Digit possible numbers are ---> 1,2,3,4,6,7,8,9 --> 8
So Total possible number are : 4 * 9 * 8 = 288
From
Pankesh Patel