Determine all positive integers $n$ such that the following statement holds: If a convex polygon with with $2n$ sides $A_1 A_2 \ldots A_{2n}$ is inscribed in a circle and $n-1$ of its $n$ pairs of opposite sides are parallel, which means if the pairs of opposite sides

\[(A_1 A_2, A_{n+1} A_{n+2}), (A_2 A_3, A_{n+2} A_{n+3}), \ldots , (A_{n-1} A_n, A_{2n-1} A_{2n})\]

are parallel, then the sides \[ A_n A_{n+1}, A_{2n} A_1\] are parallel as well.
1. **Restate the problem and the goal**: We need to determine all positive integers \( n \) such that if a convex polygon with \( 2n \) sides \( A_1 A_2 \ldots A_{2n} \) is inscribed in a circle and \( n-1 \) of its \( n \) pairs of opposite sides are parallel, then the remaining pair of opposite sides is also parallel.

2. **Lemma 1**: If \( n \) is an odd positive integer, and a convex \( 2n \)-gon \( A_1A_2\ldots A_{2n} \) is inscribed in a circle, such that \( A_1A_2 \parallel A_{n+1}A_{n+2} \), \( A_2A_3 \parallel A_{n+2}A_{n+3} \), ..., \( A_{n-1}A_n \parallel A_{2n-1}A_{2n} \), then \( A_nA_{n+1} \parallel A_{2n}A_1 \).

3. **Proof of Lemma 1**:
   - Consider directed angles modulo \( 180^\circ \). Let \( X \) be an arbitrary point on the circumcircle of the \( 2n \)-gon \( A_1A_2\ldots A_{2n} \).
   - Let \( g \) be an arbitrary line in the plane, and for every integer \( i \) such that \( 1 \leq i \leq 2n \), let \( u_i = \measuredangle(A_iA_{i+1}; g) \). The indices are cyclic modulo \( 2n \), so \( A_{2n+1} = A_1 \) and \( u_{2n+1} = u_1 \).
   - For every index \( i \), we have:
     \[
     u_i - u_{i+1} = \measuredangle(A_iA_{i+1}; g) - \measuredangle(A_{i+1}A_{i+2}; g) = \measuredangle(A_iA_{i+1}; A_{i+1}A_{i+2}) = \measuredangle A_iA_{i+1}A_{i+2}
     \]
   - Since \( X \) lies on the circumcircle of the \( 2n \)-gon, we have \( \measuredangle A_iA_{i+1}A_{i+2} = \measuredangle A_iXA_{i+2} \). Thus, \( u_i - u_{i+1} = \measuredangle A_iXA_{i+2} \) for every \( i \).

4. **Summing the angles**:
   - Summing these differences for all \( i \) from \( 1 \) to \( 2n \), we get:
     \[
     \sum_{i=1}^{2n} (u_i - u_{i+1}) = \sum_{i=1}^{2n} \measuredangle A_iXA_{i+2}
     \]
   - Since the sum of the directed angles around a point is \( 0^\circ \), we have:
     \[
     \sum_{i=1}^{2n} \measuredangle A_iXA_{i+2} = 0^\circ
     \]
   - Therefore:
     \[
     (u_1 + u_3 + \ldots + u_{2n-1}) - (u_2 + u_4 + \ldots + u_{2n}) = 0^\circ
     \]
     \[
     u_1 + u_3 + \ldots + u_{2n-1} = u_2 + u_4 + \ldots + u_{2n}
     \]

5. **Using the parallel condition**:
   - Since \( n \) is odd, we can rewrite the sums as:
     \[
     (u_1 + u_3 + \ldots + u_{n-2} + u_n) + (u_{n+2} + u_{n+4} + \ldots + u_{2n-1}) = (u_2 + u_4 + \ldots + u_{n-1}) + (u_{n+1} + u_{n+3} + \ldots + u_{2n-2} + u_{2n})
     \]
   - Given \( A_1A_2 \parallel A_{n+1}A_{n+2} \), we have \( u_{n+1} = u_1 \), \( u_{n+2} = u_2 \), and so on. Thus:
     \[
     (u_1 + u_3 + \ldots + u_{n-2} + u_n) + (u_2 + u_4 + \ldots + u_{n-1}) = (u_1 + u_3 + \ldots + u_{n-2} + u_n) + (u_2 + u_4 + \ldots + u_{n-1})
     \]
   - Most terms cancel out, leaving \( u_n = u_{2n} \), which implies \( \measuredangle(A_nA_{n+1}; g) = \measuredangle(A_{2n}A_1; g) \). Hence, \( A_nA_{n+1} \parallel A_{2n}A_1 \).

6. **Statement for even \( n \)**:
   - Assume the statement is true for some even integer \( n \). We can rewrite the statement in terms of constructing points on a circle and checking parallelism.
   - Construct a degenerate \( 2n \)-gon \( A_1A_2\ldots A_{2n} \) inscribed in a circle, such as a square \( ABCD \) with repeated points. This construction satisfies the parallel conditions but fails the final parallelism condition, leading to a contradiction.

7. **Conclusion**:
   - The statement holds if and only if \( n \) is odd.

The final answer is \( \boxed{ n } \) is odd.