Let $n\geq 3$ be integer. Given two pairs of $n$ cards numbered from 1 to $n$. Mix the $2n$ cards up and  take the card 3 times every one card. Denote $X_1,\ X_2,\ X_3$ the numbers of the cards taken out in this order taken the cards. Find the probabilty such that $X_1<X_2<X_3$. Note that once a card taken out, it is not taken a back.
1. **Define the problem and notation:**
   We are given \(2n\) cards, with two cards numbered from 1 to \(n\). We need to find the probability that when three cards are drawn sequentially without replacement, the numbers on the cards satisfy \(X_1 < X_2 < X_3\).

2. **Calculate the probability \(P(X_1 < X_2 < X_3)\):**
   The total number of ways to choose 3 cards out of \(2n\) is \(\binom{2n}{3}\). Each of these ways is equally likely.

3. **Determine the number of favorable outcomes:**
   For \(X_1 < X_2 < X_3\), we need to count the number of ways to pick 3 cards such that their numbers are in increasing order. 

4. **Use symmetry and combinatorial arguments:**
   Each set of 3 cards can be arranged in \(3!\) (6) ways, but only one of these arrangements will satisfy \(X_1 < X_2 < X_3\). Therefore, the number of favorable outcomes is \(\frac{1}{6}\) of the total number of ways to choose 3 cards.

5. **Calculate the probability:**
   \[
   P(X_1 < X_2 < X_3) = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} = \frac{\frac{1}{6} \binom{2n}{3}}{\binom{2n}{3}} = \frac{1}{6}
   \]

6. **Verify the result using integration for continuous uniform distribution:**
   For continuous random variables \(Y_1, Y_2, Y_3\) uniformly distributed on \([0, 1]\), the probability \(P(Y_1 < Y_2 < Y_3)\) can be calculated as:
   \[
   P(Y_1 < Y_2 < Y_3) = \int_0^1 \int_t^1 (1-s) \, ds \, dt
   \]
   \[
   = \int_0^1 \int_t^1 (1-s) \, ds \, dt = \int_0^1 \frac{(1-t)^2}{2} \, dt = \left[ \frac{(1-t)^3}{6} \right]_0^1 = \frac{1}{6}
   \]

7. **Conclusion:**
   The probability that \(X_1 < X_2 < X_3\) for the discrete case aligns with the continuous case as \(n \to \infty\).

The final answer is \(\boxed{\frac{1}{6}}\)