Thread:Forum Board 1/@comment-43587475-20191028222736/@comment-38360307-20191029174044

518 (I did it in my head so I might've screwed up some subtraction). Basically there are 180 multiples of 5 and 128 multiples of 7 from 100-999. There are 900 three digit numbers, so 900-180-128=592. But then we have to add multiplies of 5*7=35 because we subtracted those TWICE. 592+35=627. Wat, now I'm getting 627.