Four options have been given, out of which three are alike in some manner and one is different. Select the option that is different from the rest.

Correct option is D

Given:

Options:
A. $$\sqrt{3}$$​​
B. 0.120120012000...
C. π
D. 0.$$\overline{45}$$​​

Concept Used:

Irrational numbers: Non-repeating, non-terminating decimals (e.g. π , 0.120120012000.. , $$\sqrt{3})$$​​

Rational numbers: Either terminating or repeating decimals (e.g., $$0.\overline{45}$$ )

Solution:

A: $$\sqrt{3}$$ ( irrational )

B: 0.120120012000...   (non-repeating, non-terminating → irrational )

C: π ( irrational)

D: 0.$$\overline{45}$$​= 0.454545... ( repeating decimal → rational)

Three options (A, B, C) are irrational, but D is rational.

Thus, option (d) is right answer.