I am currently taking MIT6.006 and I came across this problem on the problem set. Despite the fact I have learned Discrete Mathematics before, I have never seen such notation before, and I would like to know what it means and how it works, Thank you: $$ f_3(n) = \binom n2$$ (Transcribed from screenshot)
What does this bracket notation mean?
$\begingroup$
discrete-mathematics
algorithms