------
## 最终结论
```python
def find_Product(arr, n):
    count = {}
    for num in arr:
        if num in count:
            count[num] += 1
        else:
            count[num] = 1

    unique_elements = [num for num, cnt in count.items() if cnt == 1]

    product = 1
    for num in unique_elements:
        product *= num

    return product

# Test cases
assert find_Product([1,1,2,3],4) == 6
assert find_Product([1,2,3,1,1],5) == 6
assert find_Product([1,1,4,5,6],5) == 120
```