Solution : (i) If unit digit is 0 or 5, then the number is division by 5. <br> (ii) If the units digit is 5, then ten thousands digit cannot be zero, now find the number of ways the other four digits can be arranged. <br> (iii) Similarly whe the units digit is 0, the other 4 digits can be arranged in `.^(5)P_(4)` ways. use the fundamental theorem of counting.
