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Binomial in a Summation

asked 2013-07-25 10:28:29 +0200

david8381 gravatar image

updated 2013-07-25 10:29:12 +0200

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?

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answered 2013-07-25 11:39:33 +0200

calc314 gravatar image

Sum is working only in a symbolic ring. So you can convert your integers to the symbolic ring as follows:

sum(binomial(SR(5),k),k,0,SR(5))

You can also use the add command:

add([binomial(5,k) for k in [0..5]])
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Asked: 2013-07-25 10:28:29 +0200

Seen: 1,245 times

Last updated: Jul 25 '13