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OpenStudy (anonymous):
using binomial theorem to prove C(n,n)2^n=3^n
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jimthompson5910 (jim_thompson5910):
odd since C(n,n) = 1
jimthompson5910 (jim_thompson5910):
so it seems like there is a typo
OpenStudy (anonymous):
okay good i wasn't crazy on that part
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