what is 8x13? I just can`t work it out!
8 x 13 =
8 x 3 = 24
8 x 10 = 80
80 + 24 = 104
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.