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Intersection() function Python
• Difficulty Level : Easy
• Last Updated : 06 Feb, 2018

Intersection of two given sets is the largest set which contains all the elements that are common to both the sets. Intersection of two given sets A and B is a set which consists of all the elements which are common to both A and B. Examples:

```Input: Let set A = {2, 4, 5, 6}
and set B = {4, 6, 7, 8}
Output: {4,6}
Explanation: Taking the common elements in both the sets,
we get {4,6} as the intersection of both the sets.
```

Syntax:

set1.intersection(set2, set3, set4….)
In parameters, any number of sets can be given

Return value:

The intersection() function returns a set, which has the intersection of all sets(set1, set2, set3…) with set1.
It returns a copy of set1 only if no parameter is passed.

Below is the Python3 implementation of the above approach:

 `# Python3 program for intersection() function`` ` `set1 ``=` `{``2``, ``4``, ``5``, ``6``} ``set2 ``=` `{``4``, ``6``, ``7``, ``8``} ``set3 ``=` `{``4``,``6``,``8``}`` ` `# union of two sets``print``(``"set1 intersection set2 : "``, set1.intersection(set2))`` ` `# union of three sets``print``(``"set1 intersection set2 intersection set3 :"``, set1.intersection(set2,set3))`

Output:

```set1 intersection set2 :  {4, 6}
set1 intersection set2 intersection set3 : {4, 6}
```

Practical applications:
In most of the probability problems, the concept of intersection of sets is needed.

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