Question

Question 3 of 4
Choose the correct syntax to index each of the following elements from a list, arr.

Answer 1

I don’t have the specific items you’re being asked to index. Could you paste the sub-questions (the elements to pick from arr)?

Meanwhile, here’s a quick cheat‑sheet for common list indexing in Python (choose the one that matches each sub‑question):

- First element: arr[0]
- Second element: arr[1]
- Third element: arr[2]
- Last element: arr[-1]
- Second‑to‑last: arr[-2]
- nth element (1-based n): arr[n-1]
- Slice from index i (inclusive) to j (exclusive): arr[i:j]
- Slice from start to j (exclusive): arr[:j]
- Slice from i (inclusive) to end: arr[i:]
- Entire list copy: arr[:]
- Single‑element slice (returns a list): arr[i:i+1]
- Find index of a value v: arr.index(v) (raises ValueError if not present)
- For nested lists: element at row r, column c: arr[r][c] (or arr[r, c] for NumPy arrays)

If you paste the four specific items, I’ll give the exact correct syntax for each.