A. Introduction If you want to poll everyone's favorite Christmas activities, how will you store the responses? You can store them in a list. B. Notes List items are ordered, changeable, and allow duplicate values, unlike sets. List items are also indexed, the first item has index  , the second item has index , etc. For example, $ list1 = [ "apple" , "banana" , "cherry" ]
$ list2 = [ 1 , 5 , 7 , 9 , 3 ]
$ list3 = [ True , False , False ]
IndexError: list index out of range
$ activities = ['snowball fight', 'sledding', 'skiing', 'caroling', 'sledding', 'caroling', 'sledding'] C. Try this: Given a list of numbers, find and print all its elements with even indices (i.e. A , A , A , ...). Given a list of numbers with all elements sorted in ascending order, determine and print the number of distinct elements in it. Given a list of your friends' favorite Christmas activities (see above), iterate through the list to determine which activity is the most popular.