Changes between Initial Version and Version 1 of Ticket #10682
 Timestamp:
 Nov 17, 2011, 7:33:42 AM (11 years ago)
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Ticket #10682 – Description
initial v1 2 2 {{{ 3 3 sage: var ('n,k') 4 sage: sum (binomial(n,k)*k 2, k, 0, n) # is right5 sage: sum (binomial(n,k)*k 2, k, 1, n) # is right n(n+1)2^(n2)6 sage: sum (binomial(n,k)*k 2, k, 2, n) # is false : I get 04 sage: sum (binomial(n,k)*k^2, k, 0, n) # is right 5 sage: sum (binomial(n,k)*k^2, k, 1, n) # is right n(n+1)2^(n2) 6 sage: sum (binomial(n,k)*k^2, k, 2, n) # is false : I get 0 7 7 }}}