find the number of 6 digit numbers that can be formed using digits 1,2,3,4,5,6 once such that the 6digit number is divisible by its unit digit.
Options
A) 648 B) 649 C) 650 D) 651 E) 652
when unit digit 1,2,3,5,6 then no. formed will be divisible by the digit at the unit place.   =&gt; 5*5p5 numbers   when unit place is 4, tenth place should be 2 or 6   =&gt; 2*4p4 numbers   total = 5*5p5 + 2*4p4 = 5*5! + 2*4! = 648   648NSWER:648
<result>A</result>
find the number of 6 digit numbers that can be formed using digits 1,2,3,4,5,6 once such that the 6digit number is divisible by its unit digit.