**Objective:** **- **Given an Integer array. Array contains duplicates of all the numbers in array except one number . Find that number.

**Example** :

int [] A = { 2,1,3,5,5,3,2,1,6,7,7,8,8}; Output : Missing duplicate is 6

**Appraoch:**

**Naive solution**is use Hash Table ..space complexity — O(n)**Better solution****- XOR**- A^A = 0 and A^B^A = B, so if we XOR all the elements, answer will be the missing no
- If we have only one element, the missing no will be that no

**Code:**

**Output**:

Missing duplicate is 6