MCQ
Which of the following is a rational number$?$
- A$\sqrt{2}$
- B$\sqrt{23}$
- ✓$\sqrt{225}$
- D$0.1010010001...$
✓
Answer
Correct option: C.
$\sqrt{225}$
The numbers of the form $\frac{\text{p}}{\text{q}},$ where $p$ and $q$ are integers and $\text{q}\neq0,$ are known as rational numbers.
$\sqrt{2},$ $\sqrt{23}$ and $0.1010010001...$ are irrational numbers, since they cannot be expressed in the form $\frac{\text{p}}{\text{q}}.$
$\sqrt{225}=15=\frac{15}{1}$ is a rational number.
Hence, the correct opion is $(c).$
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