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Which of the following decimal numbers can be exactly represented in binary notation with a finite number of bits ?

1. $0.1$
2. $0.2$
3. $0.4$
4. $0.5$
5. All the above

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+1
0.5

Binary representation of $0.5$, $0.1_2$ is the only fraction that is terminating in the given options. So it can be represented exactly.

All other options have non-terminating fraction part and cannot be represented exactly with finite number of bits.
by Boss (11.4k points)
edited
+2
IEEE754 is irrelevant to this question :)
0
@Arjun Sir you mean to say in any representation we cannot exactly represent these fractions.

Edited :)