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Explanation:
Output is 7 becauseIn the given Python code, a 2-dimensional list (or nested list) named a is defined with three sub-lists, each containing three elements. The code then prints a specific element from this list.

Let's break it down:

a = [[2, 3, 4],
[5, 6, 7],
[8, 9, 10]]
This code defines the nested list a, with three sub-lists as follows:

[2, 3, 4] is the first sub-list,
[5, 6, 7] is the second sub-list, and
[8, 9, 10] is the third sub-list.
Now, let's look at the print statement:

print(a[1][-1])
Here, a[1] refers to the second sub-list [5, 6, 7]. And [-1] is used to access the last element of that sub-list, which is 7. The negative index -1 means counting elements from the end of the list