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Bug in computing sum (of binomials)

One gets a wrong output when running the following command:

sage: sum(binomial(1,n),n,0,oo)
3

The output should be $2$ instead of $3$. Compare:

sage: sum(binomial(1,n),n,0,oo,algorithm="sympy")
2

Bug in computing sum (of binomials)

One gets a wrong output when running the following command:

sage: sum(binomial(1,n),n,0,oo)
3

The output should be $2$ instead of $3$. Compare:

sage: sum(binomial(1,n),n,0,oo,algorithm="sympy")
2