A soccer ball is usually made from a polyhedral fugure model, with two types of faces, hexagons and pentagons, and in every vertex incide three faces - two hexagons and one pentagon.

We call a polyhedron [i]soccer-ball[/i] if it is similar to the traditional soccer ball, in the following sense: its faces are \(m\)-gons or \(n\)-gons, \(m \not= n\), and in every vertex incide three faces, two of them being \(m\)-gons and the other one being an \(n\)-gon.

[list='i']
[*] Show that \(m\) needs to be even.
[*] Find all soccer-ball polyhedra.
[/list]
### Part (i): Show that \( m \) needs to be even.

1. **Vertex Configuration**:
   - Each vertex of the polyhedron is shared by three faces: two \( m \)-gons and one \( n \)-gon.
   - The internal angle of an \( m \)-gon is \( \frac{(m-2)\pi}{m} \).
   - The internal angle of an \( n \)-gon is \( \frac{(n-2)\pi}{n} \).

2. **Sum of Angles at a Vertex**:
   - The sum of the angles around a vertex must be \( 2\pi \).
   - Therefore, we have:
     \[
     2 \cdot \frac{(m-2)\pi}{m} + \frac{(n-2)\pi}{n} = 2\pi
     \]
   - Simplifying, we get:
     \[
     2 \cdot \frac{m-2}{m} + \frac{n-2}{n} = 2
     \]
     \[
     2 \left(1 - \frac{2}{m}\right) + 1 - \frac{2}{n} = 2
     \]
     \[
     2 - \frac{4}{m} + 1 - \frac{2}{n} = 2
     \]
     \[
     3 - \frac{4}{m} - \frac{2}{n} = 2
     \]
     \[
     1 = \frac{4}{m} + \frac{2}{n}
     \]

3. **Rearranging**:
   \[
   \frac{4}{m} + \frac{2}{n} = 1
   \]
   \[
   \frac{4}{m} = 1 - \frac{2}{n}
   \]
   \[
   \frac{4}{m} = \frac{n-2}{n}
   \]
   \[
   4n = m(n-2)
   \]
   \[
   4n = mn - 2m
   \]
   \[
   mn - 2m = 4n
   \]
   \[
   m(n-2) = 4n
   \]
   \[
   m = \frac{4n}{n-2}
   \]

4. **Divisibility**:
   - For \( m \) to be an integer, \( \frac{4n}{n-2} \) must be an integer.
   - This implies that \( n-2 \) must divide 4.
   - The divisors of 4 are 1, 2, and 4.
   - Therefore, \( n-2 \) can be 1, 2, or 4, giving \( n \) as 3, 4, or 6.

5. **Possible Values of \( n \)**:
   - If \( n = 3 \):
     \[
     m = \frac{4 \cdot 3}{3-2} = 12
     \]
   - If \( n = 4 \):
     \[
     m = \frac{4 \cdot 4}{4-2} = 8
     \]
   - If \( n = 6 \):
     \[
     m = \frac{4 \cdot 6}{6-2} = 6
     \]

6. **Conclusion**:
   - Since \( m \) must be an integer, \( m \) must be even.

### Part (ii): Find all soccer-ball polyhedra.

1. **Using Euler's Formula**:
   - Euler's formula for polyhedra is \( V - E + F = 2 \).
   - Let \( M \) be the number of \( m \)-gons and \( N \) be the number of \( n \)-gons.
   - Each edge is shared by two faces, so:
     \[
     E = \frac{mM + nN}{2}
     \]

2. **Vertices and Faces**:
   - Each vertex is shared by three faces, so:
     \[
     V = \frac{2E}{3}
     \]
   - Substituting \( E \):
     \[
     V = \frac{2 \cdot \frac{mM + nN}{2}}{3} = \frac{mM + nN}{3}
     \]

3. **Using Euler's Formula**:
   \[
   \frac{mM + nN}{3} - \frac{mM + nN}{2} + (M + N) = 2
   \]
   \[
   \frac{2(mM + nN)}{6} - \frac{3(mM + nN)}{6} + (M + N) = 2
   \]
   \[
   \frac{2(mM + nN) - 3(mM + nN) + 6(M + N)}{6} = 2
   \]
   \[
   -mM - nN + 6(M + N) = 12
   \]
   \[
   6M - mM + 6N - nN = 12
   \]
   \[
   M(6 - m) + N(6 - n) = 12
   \]

4. **Possible Values**:
   - For \( n = 5 \) and \( m = 6 \):
     \[
     M(6 - 6) + N(6 - 5) = 12
     \]
     \[
     N = 12
     \]
   - For \( n = 3 \) and \( m = 12 \):
     \[
     M(6 - 12) + N(6 - 3) = 12
     \]
     \[
     -6M + 3N = 12
     \]
     \[
     -2M + N = 4
     \]
     \[
     N = 2M + 4
     \]

5. **Conclusion**:
   - The only feasible solution is the traditional soccer ball with \( m = 6 \) and \( n = 5 \).

The final answer is \( \boxed{ m = 6 } \) and \( n = 5 \).