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Compute
binom{5}{3} + binom{6}{3} + binom{7}{3}

 Dec 22, 2022
 #1
avatar+1317 
+2

\(\binom{5}{3} + \binom{6}{3} + \binom{7}{3}\)

You can use hockey stick theorem (look it up and try it yourself), or you can use a calculator. Either way, you'll end up with 65.

 Dec 22, 2022

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