there are four different digits which when inserted in the blank space in number 4_5 make the number divisible by 3. Write them

If an integer's digits add to a multiple of 3, then the number itself is also a multiple of 3. 4 and 5 add to 9 so any digit between them that is a multiple of 3 will do the trick. Therefore or digits are 0, 3, 6, and 9. 



:)