Solution:
(i) 6 alone can fill the Thousand’s Place.
As a result, number of way = 1
Either 0 or 5 can fill the Unit place.
As a result, number of way
The remaining 8 digits can fill the Hundred’s place.
Hence, number of way
7 digits can be filled in the Ten’s place.
The no. of ways is 7
Thus, required number will be