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sage: clear sage: var('k') k sage: sum(binomial(5,k),k,0,5)

I get an error "cannot convert k to int"

But if instead I try something like sum(binomial(n,k),k,0,n), everything is just fine.

Anyone know how I can get around this?

sage: clear clear

sage: var('k') k var('k')

k

sage: sum(binomial(5,k),k,0,5)

I get an error "cannot convert k to int"

But if instead I try something like sum(binomial(n,k),k,0,n), everything is just fine.

Anyone know how I can get around this?

sage: var('k')

k

sage: sum(binomial(5,k),k,0,5)

I get an error "cannot convert k to int"

But if instead I try something like sum(binomial(n,k),k,0,n), everything is just fine.

Anyone know how I can get around this?