Application of Combinations - How Many Rectangles?

A short tutorial on how to find the number of rectangles in a grid.

[divyansh]

M pretty good with maths but idk how i didn't get such a simple thing, Thak you very much for this helpuf Video!!

[shuhearnyu]

In the last question, shouldn't you add up all the rectangles with units smaller than 4? In this case the answer should be 756 - 287 = 469

[tarunpurohit]

Can we count squares using combination

[JardinDesDecouvertes]

Nice. Way to help there, bud. If you can't explain it, then just say so

[JardinDesDecouvertes]

Why is 6 choose 2 the same as 6 x 5? The same for 4 choose 2. Why is it 2 x 1?

[sirsaikoplays]

isnt the first part of the video wrong?
That method would also include alll the squares too in it

[gautamswami]

Wrong way for counting rectangles you included square in it