Here in given question we are find out 4 digit distinct number from the decimal digit 0,1,2,3,4,5,6,7,8,9,
here see in above digit sequence 0 is included then we deal with 0 in deifferent manner if they involved in number
first we find those number in which 0 is not involved
------ ------ ------ -------
6 7 8 {remaining} 4{2,4,6,8 possible}
now deal with zero number
--------- ---------- ----------- ----------------
7 8 9 0{ here zero placed }
------------ ------------- -------------- ----------------
7 8 0 {placed } 4
------------ -------- --------- -----------
7 0 8 4
--------- ------------ ------------ ---------------
0 not possible
if msb is 0 then number is not four digit
so total number =6*7*8*4+7*8*9+7*8*4+7*8*4=2296