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Question: convert hypergeom to a Sum

Question:convert hypergeom to a Sum

Michael 217
convert sum
February 20 2011
0

Howcum the first of the following two statements does what the "help" says it will do, but the second statement doesn't?

 

Better yet, how can I make the second statement worK?

Thank you.

 

> convert(hypergeom([a, b],[e,f],1),Sum);
> convert(hypergeom([a, b, c],[e, f],1),Sum);

         infinity
          -----
           \        pochhammer(a, _k1) pochhammer(b, _k1)
            )     ------------------------------------------
           /      _k1! pochhammer(e, _k1) pochhammer(f, _k1)
          -----
         _k1 = 0


                   hypergeom([a, b, c], [e, f], 1)
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