We are given 4 similar dices. Denote $x_i (1\le x_i \le 6)$ be the number of dots on a face appearing on the $i$-th dice $1\le i \le 4$
a) Find the numbers of $(x_1,x_2,x_3,x_4)$
b) Find the probability that there is a number $x_j$ such that $x_j$ is equal to the sum of the other 3 numbers
c) Find the probability that we can divide $x_1,x_2,x_3,x_4$ into 2 groups has the same sum
### Part (a)
1. Each die can show any number from 1 to 6. Therefore, for each die, there are 6 possible outcomes.
2. Since there are 4 dice, the total number of possible outcomes for \((x_1, x_2, x_3, x_4)\) is:
   \[
   6 \times 6 \times 6 \times 6 = 6^4 = 1296
   \]

### Part (b)
1. We need to find the probability that there exists a number \(x_j\) such that \(x_j\) is equal to the sum of the other three numbers.
2. Let \(x_1 + x_2 + x_3 + x_4 = S\). For \(x_j\) to be equal to the sum of the other three numbers, we must have:
   \[
   x_j = S - x_j \implies 2x_j = S \implies x_j = \frac{S}{2}
   \]
3. The sum \(S\) of four dice can range from \(4\) (if all dice show 1) to \(24\) (if all dice show 6).
4. For \(x_j\) to be an integer, \(S\) must be even. The possible even values of \(S\) are \(4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24\).
5. We need to count the number of valid \((x_1, x_2, x_3, x_4)\) for each even \(S\) such that one of the \(x_i\) equals \(\frac{S}{2}\).

### Part (c)
1. We need to find the probability that we can divide \((x_1, x_2, x_3, x_4)\) into two groups with the same sum.
2. Let \(S = x_1 + x_2 + x_3 + x_4\). For the sums of two groups to be equal, \(S\) must be even.
3. The possible even values of \(S\) are \(4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24\).
4. We need to count the number of valid \((x_1, x_2, x_3, x_4)\) for each even \(S\) such that the set can be partitioned into two groups with equal sums.

### Detailed Calculation for Part (c)
1. For \(S = 4\), the only possible combination is \((1, 1, 1, 1)\), which can be divided into \((1, 1)\) and \((1, 1)\).
2. For \(S = 6\), the possible combinations are:
   - \((1, 1, 1, 3)\) which can be divided into \((1, 3)\) and \((1, 1)\)
   - \((1, 1, 2, 2)\) which can be divided into \((1, 2)\) and \((1, 2)\)
3. For \(S = 8\), the possible combinations are:
   - \((1, 1, 3, 3)\) which can be divided into \((1, 3)\) and \((1, 3)\)
   - \((1, 2, 2, 3)\) which can be divided into \((1, 3)\) and \((2, 2)\)
4. Continue this process for all even \(S\) up to 24.

### Conclusion
1. Count the total number of valid combinations for each even \(S\).
2. Divide by the total number of possible outcomes \(1296\) to get the probability.

The final answer is \(\boxed{\text{Probability}}\)