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Let's address questions 5 to 7 step by step.

### Question 5
**How many primitive roots modulo 37 do there exist?**

For a prime \( p \), the number of primitive roots modulo \( p \) is given by \( \phi(\phi(p)) \), where \( \phi \) is Euler's totient function.

For \( p = 37 \):
\[
\phi(37) = 37 - 1 = 36
\]

Now, we find \( \phi(36) \):
\[
\phi(36) = 36 \left(1 - \frac{1}{2}\right)\left(1 - \frac{1}{3}\right) = 36 \cdot \frac{1}{2} \cdot \frac{2}{3} = 36 \cdot \frac{1}{3} = 12
\]

So, there are 12 primitive roots modulo 37.

### Question 6
**\( A \) and \( B \) are magic squares. \( A \) can be transformed to \( B \) by a sequence of row and column exchanges.**

Given:
\[
A = \begin{pmatrix}
15 & 2 & 1 & 12 \\
4 & 9 & 10 & 7 \\
8 & 5 & 6 & 11 \\
3 & 14 & 13 & 0
\end{pmatrix}
\]

\[
B = \begin{pmatrix}
14 & 8 & 5 & 3 \\
9 & 15 & 2 & 4 \\
7 & 1 & 12 & 10 \\
0 & 6 & 11 & 13
\end{pmatrix}
\]

A magic square is a square matrix of distinct positive integers in which the sum of the integers in each row, column, and main diagonal is the same. 

By examining both \( A \) and \( B \):
- Sum of the first row of \( A \): \( 15 + 2 + 1 + 12 = 30 \)
- Sum of the first row of \( B \): \( 14 + 8 + 5 + 3 = 30 \)

Continue for the other rows, columns, and diagonals. Both squares must have the same magic constant (sum).

By inspection, we can see both matrices are magic squares, and it is possible to transform one into the other by row and column exchanges.

Therefore, the statement is **True**.

### Question 7
**One of the rows of a \( 4 \times 4 \) magic square containing numbers 0, 1, ..., 15 can be \( [12, 5, 11, 4] \).**

Let's verify if the sum of \( [12, 5, 11, 4] \) matches the magic constant of a \( 4 \times 4 \) magic square with the given range.

The magic constant \( M \) for a \( n \times n \) magic square where the entries are \( 0, 1, ..., n^2 - 1 \) is given by:
\[
M = \frac{n(n^2 - 1)}{2}
\]

For \( n = 4 \):
\[
M = \frac{4(16 - 1)}{2} = \frac{4 \cdot 15}{2} = 30
\]

Now sum the given row:
\[
12 + 5 + 11 + 4 = 32
\]

Since the sum is not equal to 30, this row cannot be part of the \( 4 \times 4 \) magic square.

Therefore, the statement is **False**.

### Summary of Answers
5. 12
6. True
7. False

Would you like more details or have any questions?

Here are some questions you can ask next:
1. How do you find the magic constant for any \( n \times n \) magic square?
2. Can a magic square contain non-distinct numbers?
3. What is the significance of Euler's totient function?
4. How can you construct a magic square?
5. Are there other methods to determine if a number is a primitive root modulo \( p \)?

**Tip:** Understanding the properties and formulas related to magic squares and modular arithmetic can greatly simplify solving related problems.

Explore the concept of primitive roots modulo 37 and learn how to determine the number of primitive roots using Euler's totient function. Understand the properties of magic squares and how one can be transformed into another through row and column exchanges. Detailed solutions and explanations provided.

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