Question

How many rational numbers between 3and4

Answer 1

Some rational numbers between 3 and 4 are infinitive. Some of them are:
3.1
3.2
3.3
3.4
3.5
3.6 
3.7
3.8
3.9
And infinitive.

Answer 2

Between numbers 3 and 4, there are infinitely many rational numbers.


$Example:\\\\3\frac{1}{2};\ 3\frac{2}{3};\ 3\frac{3}{4};\ 3\frac{4}{5};\ 3\frac{5}{6};\dots;3\frac{n}{n+1};\ \dots\ (n\in\mathbb{N^+})\\\\or\\\\3.1;\ 3.11;\ 3.111;\ 3.1111;\ 3.11111;\dots$

You're welcome.

Answer 3

there are infinite number of rational numbers between 3 & 4.For example-
3.1
3.11
3.2
3.22
3.3
3.33
3.4
3.44
3.5
etc