what between 2 and 4

Saseflower is correct.......

And, to add to what she has said, a man named Cantor showed that, between any two values on the number line, an infinite (and uncountable) number of values exist.......

3 is between 2 and 4. If you imagine a number line, from 0 to 10, it goes 1, 2, 3, then 4 and so on