Hi, I got this from the report a problem link:

Typing (in the inotebook)

var('t,k,i')
sum(binomial(i+t,t),i,0,k)

results in

binomial(k + t + 1, t + 1) - 1

which is false, the well-known answer is binomial(k + t + 1, t + 1)
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