{x l x is a natural number between 10 and 20}
I know the answer is 11, 12, 13,14, 15, 16, 17, 18, and 19. but how do i represent it?
Alan's answer is better because your answer could include 12.5 etc
Another alternative might be
$$\\10 note:\; Z\;is \;the\; symbol\; for\; integers.$$
How about x = {11, 12, 13, 14, 15, 16, 17, 18, 19}?
it was actually 10<x<20