Which of the following is not irrational ?

Correct option is D

Solution:

Given:

We need to identify which of the given options is not an irrational number.

Formula Used:

A number is irrational if it cannot be expressed as a fraction of two integers and its decimal representation is non-terminating and non-repeating. A square root of a number is not irrational if the number is a perfect square.

Solution:

1. Option A: $$\sqrt{10}$$​
 10 is not a perfect square.
​$$\sqrt{10}$$​ is irrational.

2. Option B: $$\sqrt{24}$$​
- 24 is not a perfect square.
- $$\sqrt{24}$$ is irrational.

3. Option C: $$\sqrt{35}$$​
- 35 is not a perfect square.
- $$\sqrt{35}$$​ is irrational.

4. Option D: $$\sqrt{121}$$​
- 121 is a perfect square $$( 121 = 11^2 )$$​
- $$\sqrt{121} = 11$$​ , which is a rational number.

Final Answer:

Option D: $$\sqrt{121}$$​