Arrange numbers $ 1,\ 2,\ 3,\ 4,\ 5$ in a line. Any arrangements are equiprobable. Find the probability such that the sum of the numbers for the first, second and third equal to the sum  of that of the third, fourth and fifth. Note that in each arrangement each number are used one time without overlapping.
1. **Total number of arrangements**: The total number of ways to arrange the numbers \(1, 2, 3, 4, 5\) in a line is given by \(5!\):
   \[
   5! = 120
   \]

2. **Setting up the problem**: Let the order of the numbers be \(a, b, c, d, e\). We need to find the probability that the sum of the first three numbers equals the sum of the last three numbers:
   \[
   a + b + c = c + d + e
   \]

3. **Simplifying the equation**: By subtracting \(c\) from both sides, we get:
   \[
   a + b = d + e
   \]

4. **Sum of all numbers**: The sum of all five numbers is:
   \[
   1 + 2 + 3 + 4 + 5 = 15
   \]

5. **Sum of the first three numbers**: Let the sum of the first three numbers be \(x\). Then the sum of the last three numbers is also \(x\). Since the middle number \(c\) is counted twice, we have:
   \[
   2x - c = 15
   \]
   Solving for \(x\):
   \[
   2x = 15 + c \implies x = \frac{15 + c}{2}
   \]

6. **Possible values for \(c\)**: Since \(x\) must be an integer, \(15 + c\) must be even. Therefore, \(c\) must be odd. The possible values for \(c\) are \(1, 3, 5\).

7. **Case 1: \(c = 1\)**:
   \[
   x = \frac{15 + 1}{2} = 8
   \]
   We need \(a + b = 8\) and \(d + e = 8\). The pairs \((a, b)\) and \((d, e)\) that sum to 8 are:
   \[
   (3, 5), (5, 3), (4, 4)
   \]
   Since \(a, b, d, e\) must be distinct and \(4\) is not in the set, the valid pairs are \((3, 5)\) and \((5, 3)\). Each pair can be arranged in \(2!\) ways, giving us \(2\) permutations for each pair.

8. **Case 2: \(c = 3\)**:
   \[
   x = \frac{15 + 3}{2} = 9
   \]
   We need \(a + b = 9\) and \(d + e = 9\). The pairs \((a, b)\) and \((d, e)\) that sum to 9 are:
   \[
   (4, 5), (5, 4)
   \]
   Each pair can be arranged in \(2!\) ways, giving us \(2\) permutations for each pair.

9. **Case 3: \(c = 5\)**:
   \[
   x = \frac{15 + 5}{2} = 10
   \]
   We need \(a + b = 10\) and \(d + e = 10\). The pairs \((a, b)\) and \((d, e)\) that sum to 10 are:
   \[
   (4, 6), (6, 4)
   \]
   Since \(6\) is not in the set, there are no valid pairs.

10. **Counting valid sequences**: For each valid \(c\), we have \(2\) permutations for each pair, and there are \(2\) pairs for each \(c\). Therefore, the total number of valid sequences is:
    \[
    2 \times 2 + 2 \times 2 = 8
    \]

11. **Calculating the probability**: The probability is the number of valid sequences divided by the total number of sequences:
    \[
    \frac{8}{120} = \frac{1}{15}
    \]

The final answer is \(\boxed{\frac{1}{15}}\)