Hello,

Do it the rough way

There are 600 multiples of 10 between 1 and 6000.

There are 1500 multiples of 4 between 1 and 6000.

There are 2000 multiples of 3 between 1 and 6000.

To the multiples of 4, remove the ones that are multiples of 10. For four multiples of 4, there is one that is a multiple of 10 ---> keep 3/4 of them, that is to say 1125.

To the multiples of 3, remove the ones that are multiples of 10 and multiples of 4.

- multiples of 10 ---> keep 9/10 (for 10 multiples of 3, there is one that is a multiple of 10) of them, that is to say 1800.

- multiples of 4, that are

*not* multiples of 10..................... This part is the most difficult in my opinion, so try it out

(it's not that difficult)

If you have problems with countings, do it with small numbers, so that you can see the reasoning