Question

Calculate number of sub matrices in india indiabix

Answer 1

Here is your answer~

I had to use colors to understand why. First, I drew three squares (1st for row 1, 2nd for row 2, third for row 3). Then, in each square I used a different color marker for the first two columns (I did brown for column 1 and yellow for column 2, but try primary colors so they'll make a secondary). The product is that the third column is made by whatever portion of the square was ONLY touched by ONE [primary] color.

❤️I hope it's help