Let $a,b,c$ be distinct real numbers such that $a+b+c>0$. Let $M$ be the set of $3\times 3$ matrices with the property that each line and each column contain all given numbers $a,b,c$. Find $\{\max \{ \det A \mid A \in M \}$ and the number of matrices which realise the maximum value.

[i]Mircea Becheanu[/i]
1. **Understanding the problem**: We need to find the maximum determinant of a \(3 \times 3\) matrix \(A\) where each row and each column contains the distinct real numbers \(a, b, c\). Additionally, we need to determine the number of such matrices that achieve this maximum determinant value.

2. **Matrix structure**: Since each row and each column must contain \(a, b, c\), we can start by fixing the first row as \([a, b, c]\). The remaining rows must be permutations of \([a, b, c]\) such that each column also contains \(a, b, c\).

3. **Fixing the first row**: Assume the first row is \([a, b, c]\). We need to determine the possible configurations for the second and third rows. Let's consider the second row starting with \(b\). This forces the second row to be \([b, c, a]\) and the third row to be \([c, a, b]\).

4. **Determinant calculation**: The matrix \(A\) is:
   \[
   A = \begin{pmatrix}
   a & b & c \\
   b & c & a \\
   c & a & b
   \end{pmatrix}
   \]
   The determinant of \(A\) is calculated as follows:
   \[
   \det(A) = \begin{vmatrix}
   a & b & c \\
   b & c & a \\
   c & a & b
   \end{vmatrix}
   \]
   Using the cofactor expansion along the first row:
   \[
   \det(A) = a \begin{vmatrix}
   c & a \\
   a & b
   \end{vmatrix}
   - b \begin{vmatrix}
   b & a \\
   c & b
   \end{vmatrix}
   + c \begin{vmatrix}
   b & c \\
   c & a
   \end{vmatrix}
   \]
   Calculating the 2x2 determinants:
   \[
   \begin{vmatrix}
   c & a \\
   a & b
   \end{vmatrix} = cb - a^2
   \]
   \[
   \begin{vmatrix}
   b & a \\
   c & b
   \end{vmatrix} = b^2 - ac
   \]
   \[
   \begin{vmatrix}
   b & c \\
   c & a
   \end{vmatrix} = ba - c^2
   \]
   Substituting these back into the determinant expression:
   \[
   \det(A) = a(cb - a^2) - b(b^2 - ac) + c(ba - c^2)
   \]
   Simplifying:
   \[
   \det(A) = acb - a^3 - b^3 + abc + abc - c^3
   \]
   \[
   \det(A) = a^3 + b^3 + c^3 - 3abc
   \]

5. **Maximum determinant**: The maximum value of the determinant is \(a^3 + b^3 + c^3 - 3abc\).

6. **Number of matrices**: There are \(3!\) (6) permutations of \([a, b, c]\) for the first row. Each permutation of the first row uniquely determines the second and third rows to maintain the property that each column contains \(a, b, c\). Therefore, there are 6 such matrices.

The final answer is \(\boxed{a^3 + b^3 + c^3 - 3abc}\) and the number of such matrices is \(\boxed{6}\).