Given three arrays, we have to find common elements in three sorted lists using sets.

Examples:

Input: ar1 = [1, 5, 10, 20, 40 , 80] ar2 = [6, 7, 20, 80, 100] ar3 = [3, 4, 15, 20, 30, 70, 80, 120] Output: [80, 20] Input: ar1 = [1, 5 , 5] ar2 = [3, 4, 5, 5, 10] ar3 = [5, 5, 10, 20] Output: [5]

** Fit: We have given three arrays, with the help of sets you can easily find the intersection of these arrays. **

The intersection method simply ensures the intersection of both arrays on which you want to perform the intersection operation (or simply gives the common elements in both arrays). We will take three arrays and then select an intersection.

Below is the implementation of the above approach:

```
``` |

Output:

[80, 20]

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