Question 1162297
.
<pre>

Last digit is one of 5 odd digits 1, 3, 5, 7 or 9.  5 options.


First digit is any of the remaining 9 digits except of 0.  9-1 = 8 options.



    So far, 2 digits of the 10 digits are used; the remaining 8 digits of the 10 digits are still free.



Second digit from the left is any of remaining 8 digits.  8 options.


Third digit from the left is any of remaining 7 digits.  7 options.


In all, there are  5*8*8*7 = 2240 different combinations.


<U>ANSWER</U>.  Under the given conditions,  2240 different codes are possible.
</pre>

Solved.


I am ready to accept your "thanks" for my teaching.