Final answer:
The expression list1 * 2 in programming duplicates the list [1, 3, 2], resulting in a new list [1, 3, 2, 1, 3, 2].
Step-by-step explanation:
When you perform the operation list1 * 2 in programming, particularly in a language like Python, it does not multiply the numbers within the list by 2. Instead, it replicates the entire list and concatenates it to the original. So, given list1 is [1, 3, 2], the result of list1 * 2 would be [1, 3, 2, 1, 3, 2]. This sequence is created by taking the original list and following it with another copy of itself, hence the list length is doubled.
The list replication feature is useful for creating larger lists from smaller ones, but care should be taken as it copies references to the objects in the list, which can be an important consideration if the list contains mutable objects.