method 1
The three rational numbers lying between 0 and 0.1 are 0.01. 0.05. 0.09.
The twenty rational numbers between 0 and 0.1 are 0.001. 0.002. 0.003,
0.004. 0.011,0.012, 0099.
24 also can obtain like this
To determine any number of rational numbers between 0 and 0.1 insert 0
after the decimal.
method 2
rational numbers between 0 and 0.1 is =
as 0.1 = 1/10, we can write as rational number between 0 and 0.1
9 rational numbers between 0 and 1/10 = 1/11, 1/12, 1/13, 1/14, 1/15, 1/16, 1/17, 1/18, 1/19