How 8 came in the output?

Question

https://code.sololearn.com/c35ATHcNYGhA/?ref=app

Answer 1

It is a 2D array!

Col 0 1 2 3
Row 0 [[1,3,4,5],
Row 1 [2,6,8,9]]

So, the index is taken as -- row and then column

So, (x)[1,2]

is Row 1, column 2

Which is 8

Answer 2

[2, 6, 8, 9] is in index position 1 of list and 8 is in index position 2 of [2, 6, 8, 9]
list[1][2] = 8