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Revision: Enquiry on Chap 2 - Real Numbers

*A question from Joshua Yew:*

**Is 0 a rational number?**

A number is a rational number if we can expressed it as a fraction a/b where a and b are integers and b is not zero.

Let's look at zero - it is a result from fractions like 0/5, 0/89 ?

In other words, Zero can be expressed a fraction such that the numerator is an integer and the denominator is an integer that is not zero.

Hence 0 is a rational number.
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