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Martin Argerami
5:02 AM
A candidate for reopening (and avoid deletion):
math.stackexchange.com/questions/3352424/…
11 hours later…
Jack
4:26 PM
U:
How to find the sum $\binom{n}{r}+ \binom{n-1}{r-1}+\cdots +\binom{n-r}{0}$
That one was a duplicate to
math.stackexchange.com/q/2626089
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