How many 4 digit even numbers do not use any digit more than once
Choose the correct choice from the following.
A) 1720	B) 2160	C) 2240	D) 2460	E) 2520
A B 2240 D ( thousand , hundreds, tens, units)   D can be 0 2 4 6 8 ( any of the 5 digits )   A can be anything except (D or 0) so 8 possibilities   2240 can be anything except A and B so 8 possibilities   B can be anything except ( A D 2240 ) so 7 possibilities   total ways are   8 * 7 * 8 * 5= 
<gadget id="calculator">  8 * 7 * 8 * 5</gadget>
<output>2_240</output>
2240   ANS:2240
<result>C</result>
How many 4 digit even numbers do not use any digit more than once