# Intersection() function Python

**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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