Questions about arrays loop

#1

Why do we use <= 4 in the i for loop and <= 2 in the j for loop, like what does those numbers mean.

#2

We use <=4 for row and <=2 for columns because there are 5 rows and 3 columns, and we want to traverse through every element of the array. Top left corner being <0,0> and bottom right corner being <4,2>

#3

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