In the figure below ,$4$ of the $6$ disks are to be colored black and $2$ are to be colored white. Two colorings that can be obtained from one another by rotation or reflection of the entire figure are considered the same. [img]https://i.imgur.com/57nQwBI.jpg[/img]

There are only four such colorings for the given  two colors, as shown.

In how many ways can we color the $6$ disks such that $2$ are colored black , $2$ are colored white, $2$ are colored blue with the given identification condition?
To solve this problem, we will use Burnside's Lemma, which is a tool in group theory for counting the number of distinct objects under group actions, such as rotations and reflections.

1. **Identify the Symmetry Group:**
   The symmetry group of the hexagon consists of 6 elements: 3 rotations (0°, 120°, 240°) and 3 reflections (across axes passing through opposite vertices or midpoints of opposite sides).

2. **Calculate Fixed Points for Each Symmetry:**
   - **0° Rotation (Identity):**
     Every coloring is fixed under the identity rotation. The number of ways to color the disks with 2 black, 2 white, and 2 blue is given by the multinomial coefficient:
     \[
     \binom{6}{2,2,2} = \frac{6!}{2!2!2!} = 90
     \]
   - **120° and 240° Rotations:**
     For a coloring to be fixed under a 120° or 240° rotation, each set of 2 disks of the same color must be positioned 120° apart. This is impossible with 2 disks of each color, so there are no fixed points:
     \[
     \text{Fixed points} = 0
     \]
   - **Reflections:**
     Each reflection axis divides the hexagon into two sets of 3 disks. For a coloring to be fixed under reflection, each pair of disks on either side of the axis must be the same color. There are 3 reflection axes, and for each axis, we can choose 2 out of the 3 positions on one side to be black, white, or blue. This gives:
     \[
     \binom{3}{1,1,1} = \frac{3!}{1!1!1!} = 6
     \]
     Since there are 3 reflection axes, the total number of fixed points for reflections is:
     \[
     3 \times 6 = 18
     \]

3. **Apply Burnside's Lemma:**
   Burnside's Lemma states that the number of distinct colorings is the average number of fixed points of the group actions:
   \[
   \text{Number of distinct colorings} = \frac{1}{|G|} \sum_{g \in G} \text{Fixed points of } g
   \]
   Here, \(|G| = 6\) (the number of symmetries), and the sum of fixed points is:
   \[
   90 (\text{identity}) + 0 (\text{120° rotation}) + 0 (\text{240° rotation}) + 18 (\text{reflections}) = 108
   \]
   Therefore, the number of distinct colorings is:
   \[
   \frac{108}{6} = 18
   \]

The final answer is \(\boxed{18}\).