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How many ways can a teacher arrange 5 students in the front row of classroom with total 23 students?

Let the number of students in the class be $n = 23$.

The number of students to be arranged in the front row is $k = 5$.

We want to arrange 5 students out of 23 students in the front row.

The order of the students matters, so we use permutations.

The number of ways to arrange 5 students out of 23 students is given by the permutation formula:

$$P(n, k) = \frac{n!}{(n-k)!}$$

In this case, $n = 23$ and $k = 5$.

$$P(23, 5) = \frac{23!}{(23-5)!} = \frac{23!}{18!} = 23 \times 22 \times 21 \times 20 \times 19$$

$$P(23, 5) = 23 \times 22 \times 21 \times 20 \times 19 = 4903140$$

Therefore, there are 4,903,140 ways to arrange 5 students in the front row of the classroom from a total of 23 students.

The number of ways to arrange 5 students from 23 students in the front row is given by the permutation formula:

$$P(23, 5) = \frac{23!}{(23-5)!} = \frac{23!}{18!} = 23 \times 22 \times 21 \times 20 \times 19$$

Calculating the product:

$23 \times 22 \times 21 \times 20 \times 19 = 4903140$

Thus, there are 4,903,140 ways to arrange 5 students in the front row of the classroom.

Final Answer: The final answer is $\boxed{4903140}$

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