How many three digit even numbers do not use any digit more than once
Choices:  A) None of these  B) 2160  C) 2240  D) 2460  E) 2520
The Way i solved it is   None of these B C ( hundreds, tens, units)   C can be 0 2 4 6 8 ( any of the 5 digits )   None of these can be anything except (D or 0) so 8 possibilities   B can be anything execpt ( None of these D C ) so 7 possibilities   total ways are   7 * 8 * 5= 
<gadget id="calculator">  7 * 8 * 5</gadget>
<output>280</output>
280   None of thesens :None of these
<result>A</result>
How many three digit even numbers do not use any digit more than once