In Python, a Set is a collection data type that is unordered and mutable. A set cannot have duplicate elements. Here, the task is to find out the number of elements present in a set. See the below examples.

**Examples:**

Input:a = {1, 2, 3, 4, 5, 6}Output:6Input:a = {'Geeks', 'For'}Output:2

Thee idea is use len() in Python

**Example 1:**

`# Python program to find the length ` `# of set ` ` ` `set1 ` `=` `set` `() ` ` ` `# Adding element and tuple to the Set ` `set1.add(` `8` `) ` `set1.add(` `9` `) ` `set1.add((` `6` `, ` `7` `)) ` ` ` `print` `(` `"The length of set is:"` `, ` `len` `(set1)) ` |

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**Output:**

The length of set is: 3

**Example 2:**

`n ` `=` `len` `({` `1` `, ` `2` `, ` `3` `, ` `4` `, ` `5` `}) ` ` ` `print` `(` `"The length of set is:"` `, n) ` |

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**Output:**

The length of set is: 5

**How does len() work?**

`len()`

works in `O(1)`

time as the set is an object and has a member to store its size. Below is description of `len()`

from Python docs.

Return the length (the number of items) of an object. The argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).

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