How many rectangles are there in a 8x8 chess board?
The geometry behind 1^3+2^3+...+n^3, see 6:00, https://youtu.be/pxYhN3hvKXM
Proof by induction, https://youtu.be/w362XRZy5as ,
a combinatoric problem, find the pattern, discrete math problem, number of rectangles on a checkerboard
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