Question

Which of the following numbers is irrational?

Answer 1

 all except pi are rational. 

2.333... = 21/9 
1.5 = 3/2

Answer 2

Answer: Third Option is correct.

Step-by-step explanation:

Since we have given that

1) 1.5- it  is a rational number as it can be written in $\frac{p}{q}$ form.

i.e. $1.5=\frac{15}{10}=\frac{3}{2}$

2) $\frac{8}{9}$- It is a rational number as it is written in  $\frac{p}{q}$ form.

3) 2.3 - It is a rational number as it can be written in  $\frac{p}{q}$ form.

i.e. $2.3=\frac{23}{10}$

4) pi - It is irrational number as it can't be written in  $\frac{p}{q}$ form.

Hence, Third Option is correct.