how to find the subset: having 9 elements ?

To find subsets with 9 elements, you need a set that contains at least 9 elements. Then, you can use mathematical principles to generate all possible combinations.

Here's a step-by-step guide to finding subsets with 9 elements:

1. Start with a set that contains more than 9 elements. For example, let's use the set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}.

2. Determine the total number of elements in the set. In this case, the set has 10 elements.

3. Use a mathematical formula to calculate the total number of subsets that can be formed from a set with n elements. The formula is 2^n, where n is the number of elements in the set. In this case, there are 2^10 = 1024 subsets that can be formed from the set.

4. Generate all possible combinations of the elements in the set using loops or recursion. Here's an example code snippet in Python using recursion to generate subsets:

```python
def subsets(set, subset, index):
if index == len(set):
if len(subset) == 9:
print(subset)
return
subsets(set, subset, index + 1)
subsets(set, subset + [set[index]], index + 1)

set = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
subset = []
index = 0
subsets(set, subset, index)
```

5. Run the code or algorithm to generate all possible subsets. In this example, the program will print all subsets with 9 elements.

Note: Generating all possible subsets can be computationally intensive, especially for large sets. Make sure to consider the time and memory requirements of the solution when dealing with larger sets.