Final answer:
The representation of a decimal number is a number that includes a decimal point. Option d) 25 is the representation of a whole number and does not have a decimal point. Options a) 2, b) 33/10, and c) 1/2 are all examples of decimal numbers.
Step-by-step explanation:
The representation of a decimal number is a number that includes a decimal point. Out of the options given, option d) 25 is the representation of a whole number and does not have a decimal point. The other options a) 2, b) 33/10, and c) 1/2 are all examples of decimal numbers.