Question

insert 16rational number between 2.1 and 2.2​

Answer 1

you can use formula

d=(y-x)/(n+1)

there n rational number laying between x and y are (x+d),(x+2d),(x+3d),and......(x+nd).

Answer 2

Answer

2.1 means 2.100 &2.2 means 2.200 right!

So you can select the numbers between 2.100 & 2.200.

i.e. 2.101

2.161

2.154 etc

Don't forget that between any two rational numbers there lies infinite numbers. That's it !

2.