To determine which of the options is NOT an irrational number, let's briefly analyze each option:

1. **$\sqrt{21}$**: This is the square root of a non-perfect square, making it an irrational number.
2. **$3$**: This is a whole number, which is rational (since it can be expressed as $\frac{3}{1}$).
3. **$e$**: This is Euler's number, which is an irrational number.
4. **$\pi$**: This is also an irrational number.

### Final Answer
The option that is NOT an irrational number is **$3$**.

Question

To determine which of the options is NOT an irrational number, let's briefly analyze each option:

1. **$\sqrt{21}$**: This is the square root of a non-perfect square, making it an irrational number.
2. **$3$**: This is a whole number, which is rational (since it can be expressed as $\frac{3}{1}$).
3. **$e$**: This is Euler's number, which is an irrational number.
4. **$\pi$**: This is also an irrational number.

### Final Answer
The option that is NOT an irrational number is **$3$**.

Knowee AI · Accepted Answer

To determine which of the options is NOT an irrational number, let's briefly analyze each option:

1. **$\sqrt{21}$**: This is the square root of a non-perfect square, making it an irrational number.
2. **$3$**: This is a whole number, which is rational (since it can be expressed as $\frac{3}{1}$).
3. **$e$**: This is Euler's number, which is an irrational number.
4. **$\pi$**: This is also an irrational number.

### Final Answer
The option that is NOT an irrational number is **$3$**.

Which of the following is NOT an irrational number?Group of answer choices√21/3eπ

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