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someone who's good at maths, show me how this works.
This isnt cheating, its learning. Im not sure how im going to write this out but...
Here we go:
Prove that
(K+2) - (k)
(3) (3) = K^2
In english it would read
"Prove that "K+2 choose 3" minus "K choose 3" equals "K squared""
Cheers!