Question

Look at the following interactive session, in which a two-dimensional list is created. How many rows and how many columns are in the list? \\[\text { numbers }\left.=\left[\begin{array}{llllll} 1 & 1, & 2 & 1 & {[10,} & 20 \end{array}\right],\left[\begin{array}{lll} 100, & 200 & 1 & 1000, & 2000\end{array}\right]\right]\\]

Short answer

Answer: The given list "numbers" consists of 2 rows and 5 columns.

Step-by-step solution

Identify rows in the list

To count the number of rows, we have to count the number of sub-lists in the main list. Looking at the problem, we can see two main sub-lists within the list: 1. [1, 1, 2, 1, [10, 20]] 2. [100, 200, 1, 1000, 2000] As there are two sub-lists, there are 2 rows in the given list.

Identify columns in each row

To count the number of columns, we need to count the number of elements in each row (sub-list). Do this separately for both rows: 1. In the first row, we see 5 elements: 1, 1, 2, 1, [10, 20] 2. In the second row, we see 5 elements: 100, 200, 1, 1000, 2000 Each row consists of 5 columns, so there are 5 columns in the list.

Present the answer

The given two-dimensional list called "numbers" consists of 2 rows and 5 columns.