Which of the following cannot be expressed in the formp/q, where p and q are integers and q not equal to ?

A ) 0.45

B ) 0.3232......

C) 0.102003000...

D ) 2.5

if a number can be represented as p/q form (i.e. number is a rational number)

if it is a  terminating decimal or non terminating recurring decimal.

so from the options : option (A) is a terminating decimal.

option (B) is  non terminating recurring decimal.

option (D) is a terminating decimal.

only option (C) does not satisfy the above criteria of rational number, so it can not be represented as p/q form.

hope this helps you.

cheers!!